- Home
- Company
- Discover
Stories from our adventures
16 Feb 2021
Category:
Challenge, Challenge Inspiration
We've reduced registration fees on some of our most iconic challenges, so you can take on your next adventure for less! Don't wait though - these offers expire at the end of February!
READ MORE
12 Feb 2021
Category:
Challenge, Challenge Inspiration
In this journal we’re answering a few of our most commonly-asked questions about how your money is protected when you book a challenge with us, so you can adventure with confidence!
READ MORE
09 Feb 2021
Category:
Challenge
If you'd prefer your own room or tent during your challenge, we're here to help! We've significantly reduced the single occupancy costs on our challenges - check out our Journal to find out more.
READ MORE
19 Jan 2021
Category:
Challenge, Challenge Inspiration, Challenger Stories
We chat to our ground handlers in Vietnam, Cambodia and Thailand about why these are some of the safest countries in the world to visit when travel reopens, and give you our top picks for your next Asian trekking or cycling challenge!
READ MORE
15 Jan 2021
Category:
Challenge Inspiration
Is your sense of adventure in need of a top-up? Our brand new Challenge Booster Scheme has been extended, and is here to help! Secure your space on selected bucket list treks, cycles or sleds with a payment of just 50% of the registration fee
READ MORE
17 Dec 2020
Category:
This is it - our final Advent offer is here! You could save £150 when your register for your next adventure - find out how!
READ MORE
16 Dec 2020
Category:
Team News
Our offices will be closed over the Christmas period - keep reading for our opening hours.
READ MORE
10 Dec 2020
Category:
Adventure Discounts
A week has passed already and we're holding another one-day adventure-filled Advent Sale - this time you can save £100!
READ MORE
03 Dec 2020
Category:
Adventure Discounts
Here at Global Adventure Challenges we are getting into the Christmas spirit and to celebrate, we're holding a one-day adventure-filled Advent Sale!
READ MORE
25 Nov 2020
Category:
Our incredible Black Friday sale is now on! We’re offering discounts of up to 35% off registration fees across our 2020 & 2021 adventures* - so now’s the time to sign up for the adventure of a lifetime!
READ MORE
09 Oct 2020
Category:
Split the cost of signing up for your challenge and pay just 50% of your registration fee at the time of booking - the remaining 50% will be due on or before 31 January 2021!
READ MORE
21 Aug 2020
Category:
Challenge Inspiration, New Destinations
Along with our new dates for 2022, comes five exciting new challenges! Whether you want to challenge yourself close to home or push your boundaries to take on a tropical trek through lush Caribbean landscapes, our new adventures aim to excite!
READ MORE
19 Aug 2020
Category:
Challenge, Challenge Inspiration
Are you looking to take on one of the best walks in the UK? We’re here to help! From historic adventures to challenging climbs, here are some of our best UK walks.
READ MORE
28 May 2020
Category:
Challenge, Challenge Inspiration, Challenger Stories
We have a free place on one of our most exciting challenges to give away to one NHS worker, and we need you to nominate the winner on our Facebook page!
READ MORE
27 May 2020
Category:
Adventure Discounts
If you join us in support of an NHS charity we'll make the challenge of a lifetime a little easier, and offer 10% off your registration fee!
READ MORE
26 May 2020
Category:
Adventure Discounts
We're excited to announce a 15% discount on open challenge registration fees for NHS staff!
READ MORE
04 May 2020
Category:
TrekFest, Training and Preparation
Our ultimate UK trekking challenge now has a virtual option – so you can take on the challenge from your own home, while sticking to social distancing guidelines!
READ MORE
28 Apr 2020
Category:
Challenge, Challenge Inspiration
Today we're bringing you a very special Adventure Journal - we asked our very first Challenge Leader, Teri, to talk us through how she started her career, and some of her highlights so far!
READ MORE
27 Apr 2020
Category:
Challenge, Challenge Inspiration
Today's Adventure Journal takes us to Cuba - where we meet Challenge Guide, Erik!
READ MORE
22 Apr 2020
Category:
Challenge, Challenge Inspiration, Challenger Stories
Meet Ruben - one of the amazing guides on our Inca Trail Trek, Peru!
READ MORE
20 Apr 2020
Category:
Challenge, Challenge Inspiration, Challenger Stories
Meet Dome - one of the awesome Challenge Guides on our brand new Cycle Thailand adventure!
READ MORE
14 Apr 2020
Category:
Challenge, Challenge Inspiration, Challenger Stories
If you're lucky enough to have been on our Himalayas Trek or Everest Base Camp Trek, you may already know Dawa - one of our incredible guides from Nepal!
READ MORE
08 Apr 2020
Category:
With many traditional fundraising methods currently ruled out due to social distancing, how can you continue to raise funds for your chosen charity? Here are our suggestions!
READ MORE
08 Apr 2020
Category:
Training and Preparation
Your normal way of training for an event may be off the table, but we’ve put together our top tips for training for a challenge while social distancing!
READ MORE
07 Apr 2020
Category:
Challenge, Challenge Inspiration
With so much uncertainty at the moment, we know it’s a tricky time to commit to paying the registration fee in one lump – which is why we’ve introduced the Flexi-Fee Challenge Scheme.
READ MORE
03 Apr 2020
Category:
Challenge, Challenge Inspiration, Challenger Stories
If you're looking for some adventure inspiration, keep reading! One of our awesome Challenge Leaders, Sam, talks us through his favourite experiences.
READ MORE
31 Mar 2020
Category:
Challenge, Challenge Inspiration
If you’re anything like us, you’re using your time at home to refresh your bucket list. So we thought we’d take the opportunity to chat to some of our awesome tour guides about why their challenge should be next on your list!
READ MORE
30 Mar 2020
Category:
Beyond the struggle
We’ve put together our top tips on promoting your challenges during the current climate – so that when the time comes to travel again, your supporters will be ready to go!
READ MORE
02 Mar 2020
Category:
Challenge Inspiration
If you’re looking to take on a cycle challenge for a charity close to your heart, keep reading! We’ve pulled together a handful of our favourite charity bike rides from across the globe.
READ MORE
20 Feb 2020
Category:
Challenge, Team News
We understand that participants will have many questions and concerns regards the current outbreak of COVID-19 (Coronavirus) and its spread around the world.
READ MORE
12 Feb 2020
Category:
Challenge Inspiration, Training and Preparation, Challenger Stories, Team News
At the end of last year, Emma took on our Dalai Lama Trek and explored the magnificent foothills of the Indian Himalayas! We caught up with her to hear all about her Indian adventure …
READ MORE
21 Jan 2020
Category:
Challenge Inspiration
Are you looking for a UK cycle challenge? From cycling across Wales to conquering the length of Britain by bike. Check out our cycling adventures here.
READ MORE
13 Jan 2020
Category:
Have you signed up to a trekking challenge? Check out our top tips on the best ways to prepare for mountain hiking - from training tips to how you can make time for your treks.
READ MORE
19 Dec 2019
Category:
Challenge Inspiration
It’s been an incredible year at Global Adventure Challenges, and we’ve hit some amazing milestones over the past twelve months!
READ MORE
18 Dec 2019
Category:
Challenge Inspiration
What would you like to achieve in 2020? To help you write your New year's resolutions, we've created your 2020 Bucket List!
READ MORE
18 Dec 2019
Category:
Challenge Inspiration, Training and Preparation
Are you enjoying a moment of peace and quiet amongst the Christmas chaos? Grab a hot chocolate and get reading our top ten Adventure Journal posts of 2019...
READ MORE
16 Dec 2019
Category:
Adventure Discounts
It’s time for our final Advent-ure discount! Save £150 on your next adventure! Find out more here.
READ MORE
16 Dec 2019
Category:
Team News
The Global Adventure Challenges office will be closed over the Christmas period. Check out our opening times here.
READ MORE
09 Dec 2019
Category:
Adventure Discounts
Our next Advent Sale is here! 10 lucky people can save a massive £100 on their open challenge registration fee! Find out more here.
READ MORE
05 Dec 2019
Category:
Challenger Stories
Hear about all things adventure from Lee, one of our experienced challengers - from his favourite locations to some great top tips!
READ MORE
05 Dec 2019
Category:
Adventure Discounts
Our Advent Sale is here! 30 lucky people can save £30 on their open challenge registration fee! Find out more here.
READ MORE
03 Dec 2019
Category:
Team News
Here at Global Adventure Challenges we are committed to making a positive difference and have just introduced our brand-new climate care strategy! Find out more here.
READ MORE
25 Nov 2019
Category:
Adventure Discounts
Today is the final day our incredible Black Friday Sale! Save 25% on your registration fee & receive a free TrekFest place when you sign up to selected overseas trekking challenges!
READ MORE
25 Nov 2019
Category:
Adventure Discounts
Save 35% on your Cycle Mallorca or Northern Lights registration fee in our Black Friday Flash Sale!
READ MORE
25 Nov 2019
Category:
Adventure Discounts
Save 35% on your Cycle Thailand or Trek to Petra registration fee in our Black Friday Flash Sale!
READ MORE
22 Nov 2019
Category:
Adventure Discounts
Save 35% on your Camino de Santiago Trek registration fee in our Black Friday Flash Sale!
READ MORE
22 Nov 2019
Category:
Adventure Discounts
Save 35% on your Great Wall of China Cycle registration fee in our Black Friday Flash Sale!
READ MORE
21 Nov 2019
Category:
We have six brand new adventures to add to our 2021 challenge calendar - From cycling in Mallorca to trekking to the iconic sandstone city of Petra! Find out more here.
READ MORE
21 Nov 2019
Category:
Adventure Discounts
Our incredible Black Friday Sale in now live - giving you a full week of adventure discounts! Find out how you can save on your challenge registration fee, and join us on an adventure of a lifetime!
READ MORE
14 Nov 2019
Category:
Challenge Inspiration
Are you dreaming of sunshine and warmer days? Check out our incredible range of charity treks abroad and join us on adventure of a lifetime in 2020!
READ MORE
29 Oct 2019
Category:
Challenger Stories
Global Adventure Challenger, Steve, has taken on an impressive five cycling challenges with us over the years. Hear all about his experiences and read his top tips here!
READ MORE
22 Oct 2019
Category:
Challenge Inspiration
If cycling in Burma has always been on your bucket list, then check out our incredible Road to Mandalay adventure and join us for a challenge like no other!
READ MORE
08 Oct 2019
Category:
Team News
From our passion for adventure to our years of experience. Here’s why we think you should join Global Adventure Challenges for your next adventure …
READ MORE
03 Oct 2019
Category:
Challenge Inspiration
Are you thinking of joining us on a cycling adventure in 2020? Check out our fantastic offer on our European Cycling Challenges and achieve something amazing!
READ MORE
01 Oct 2019
Category:
Challenge Inspiration
Think you know everything about the world’s highest mountain? Think again! Discover mind-blowing facts about Mount Everest, the iconic mountain situated in the Himalayas.
READ MORE
25 Sep 2019
Category:
Team News
Next up in our Meet The Team section is Abbie - our lovely Charity Account Manager. Check out why she is in so love with Nepal and what's next on her adventure Bucket List!
READ MORE
19 Sep 2019
Category:
Challenge Inspiration
How old is Angkor Wat - Cambodia’s national symbol and the largest religious monument in the world. Find out everything you need to know about this incredible temple complex!
READ MORE
29 Aug 2019
Category:
Team News
It's time to meet the Global Adventure Challenges team, and first up is our Head of Client Accounts - Richard Lupton!
READ MORE
22 Aug 2019
Category:
Challenge Inspiration
Husky sledding in Lapland is an unforgettable adventure into the wilderness! Get ready to fuel your wanderlust …
READ MORE
21 Aug 2019
Category:
Challenge Inspiration
Are you taking on The Three Peaks Challenge? Our Marketing Officer, Katy, recently took on the challenge herself. Check out her Three Peaks Challenge top tips here.
READ MORE
06 Aug 2019
Category:
Challenge Inspiration
Havana is the largest city in the Caribbean and the start location of our Cycle Cuba challenge! Check out our top 10 things to see and do during your free time in Havana.
READ MORE
16 Jul 2019
Category:
Challenger Stories
With the Tour de France well underway, we are getting excited about our upcoming London to Paris Tour de France Cycle! If you are looking to join us in 2020 then check out what our past challengers have to say.
READ MORE
11 Jul 2019
Category:
TrekFest
TrekFest The Beacons 2019 was a huge success, with over 800 participants taking on Pen y Fan! Check out what our challengers have to say here.
READ MORE
10 Jul 2019
Category:
Challenge Inspiration
Have you ever wanted to trek the Himalayas? Discover how you can explore the world's largest mountain range on a fantastic charity challenge!
READ MORE
08 Jul 2019
Category:
Challenge, Challenge Inspiration
Our Summer Sale is now up and running! Now's the time to tick an adventure off your bucket list, and save 20% on your registration fee on our amazing open challenges.
READ MORE
05 Jul 2019
Category:
Challenge
In celebration of the 106th edition of the Tour de France, we're offering a discount on registration fees on our iconic London to Paris Tour de France cycling challenge for 2020!
READ MORE
21 Jun 2019
Category:
Challenge Inspiration
Located in the beautiful Atlas Mountains, Mount Toubkal is the highest peak in North Africa; standing at an impressive 4,167m tall. Here are our Top 5 Reasons Why You Should Climb Mount Toubkal
READ MORE
17 Jun 2019
Category:
Challenge Inspiration
India is one of our favourite adventure locations! If you’d like to explore this fascinating country, whilst combining an exciting adventure then these Indian cycle challenges are for you!
READ MORE
11 Jun 2019
Category:
Challenge Inspiration
Our Remote Highlands Trek is a fantastic charity challenge taking place in the stunning country of Iceland. Here's why we think this adventure should be top of your Bucket List.
READ MORE
05 Jun 2019
Category:
Challenge Inspiration
Mount Kilimanjaro is Africa's highest peak and the world's highest free standing mountain! But where exactly is Kilimanjaro located? Find out here!
READ MORE
28 May 2019
Category:
Challenge Inspiration
Hadrian’s Wall extends across Northumberland and Cumbria, and once marked the north western border of the Roman Empire. It is also the location of our fantastic Hadrian's Wall Trek! Find out more here.
READ MORE
23 May 2019
Category:
Challenge, Challenge Inspiration, Training and Preparation, Challenger Stories
Our Marketing Manager, Georgina, recently took part in one of our most iconic challenges – Our Great Wall of China Trek! Read her story here.
READ MORE
14 May 2019
Category:
Challenge Inspiration
Unite & Bike Against Cancer is an exciting cycling challenge series – in support of cancer charities nationwide. Find out how you can get involved in our 2020 adventure here.
READ MORE
08 May 2019
Category:
Challenge Inspiration
It's National Walking Month! So why not celebrate and sign up to a trekking challenge and raise money for the charity of your choice! Explore our range of trekking challenges here.
READ MORE
30 Apr 2019
Category:
Have you signed up to one of our charity challenges? It’s now time to get in your training and fundraising. Here are some unique fundraising ideas to help you on your way!
READ MORE
23 Apr 2019
Category:
Challenge Inspiration
Mount Everest is well known as being the tallest mountain in the world. But exactly how high is the summit of Everest? Find out all about the world's highest mountain here!
READ MORE
18 Apr 2019
Category:
The Global Adventure Challenges office will be closed over Easter - check out our opening times here!
READ MORE
11 Apr 2019
Category:
Challenge Inspiration
Our Easter Sale is now live! Save 25% on your registration fee on our 2020 overseas challenges! Keep reading for more information.
READ MORE
09 Apr 2019
Category:
Challenge Inspiration
Find out what the highest mountains in the UK are and how you can experience them on a fantastic trekking challenge!
READ MORE
02 Apr 2019
Category:
Challenge Inspiration
There are seven routes to the top of Kilimanjaro, each with their own pros and cons. Here is our summary on the different routes to take to reach the summit of the world's highest free standing mountain!
READ MORE
12 Mar 2019
Category:
Training and Preparation
Cycling challenges are a fantastic way to experience the beautiful sights of Europe, push yourself outside of your comfort zone as well as raising money for a cause that you’re passionate about. Here’s how you should prepare for a cycle across Europe!
READ MORE
06 Mar 2019
Category:
Challenge Inspiration
Europe is the perfect setting for a long-distance bike ride! But what kit do you need to cycle across Europe? Check out our essential kit list here.
READ MORE
27 Feb 2019
Category:
Corporate Challenges
Team building activities are a great way to boost morale and improve relationships within the workplace! Check out our top corporate team building ideas here!
READ MORE
18 Feb 2019
Category:
Challenge Inspiration
Trekking in the Alps is the perfect way to explore Europe’s highest mountain range. Find out how you can experience the beautiful Mont Blanc region of The Alps on an exciting hiking adventure!
READ MORE
13 Feb 2019
Category:
We have just reached an amazing 20,000 likes on Facebook! To say a huge THANKYOU we are offering a free place on our London to Paris adventure! Find out more here.
READ MORE
13 Feb 2019
Category:
Challenge Inspiration
Soak up the atmosphere in Plaza de Armas, have a pint in the world's highest Irish owned pub and explore the incredible Machu Picchu! Check out what to see and so in Cusco here!
READ MORE
05 Feb 2019
Category:
Challenger Stories
Our UK & European Events Officer, Emma, recently took part in one of our most popular challenges – Our Vietnam to Cambodia Cycle! Read her story here.
READ MORE
29 Jan 2019
Category:
Challenge Inspiration
The Sahara is the largest hot desert in the world, located in Northern Africa, and is home to some of the largest dunes in the world. Check out our top facts about the incredible Sahara Desert!
READ MORE
21 Jan 2019
Category:
Challenge Inspiration
The Yorkshire Three Peaks is a classic trekking challenge situated in the Yorkshire Dales. Find out how long it takes to complete the Yorkshire Three Peaks Challenge here.
READ MORE
14 Jan 2019
Category:
Find out how far it is from Land’s End to John O’Groats and get your next challenge underway!
READ MORE
04 Jan 2019
Category:
Challenger Stories
Hear all about our Inca Trail Trek from Katy, who recently embarked on this exciting journey to the awe-inspiring Machu Picchu!
READ MORE
20 Dec 2018
Category:
Elfie our Adventure Elf has been helping us out on the lead up to Christmas, take a look at his adventures here!
READ MORE
19 Dec 2018
Category:
Challenge Inspiration
It's an exciting new year and the perfect time to set yourself a new challenge in 2019! Here's what we think should be on your bucket list this year ...
READ MORE
19 Dec 2018
Category:
Challenge Inspiration
Achieve something incredible and make 2019 the best year ever! Here are our top five reasons why you should take on a challenge in 2019!
READ MORE
19 Dec 2018
Category:
Save £240 on open challenge registration fees!*
READ MORE
18 Dec 2018
Category:
With the New Year approaching fast, we just wanted to say THANK YOU for helping to make 2018 our biggest and best year yet!
READ MORE
18 Dec 2018
Category:
The Global Adventure Challenges office will be closed over Christmas - check out our opening times here!
READ MORE
13 Dec 2018
Category:
Challenge Inspiration
Vietnam and Cambodia are two beautiful countries situated in South East Asia. Read our guide to visiting Vietnam and Cambodia, including visa applications, vaccinations and where to visit!
READ MORE
11 Dec 2018
Category:
Save £170 on the adventure of a lifetime with our Advent offer! But you'll need to be quick...
READ MORE
05 Dec 2018
Category:
Training and Preparation
Have you signed up to a challenge of a lifetime? Read our top 5 fundraising tips to help you on your way to reaching your fundraising target.
READ MORE
04 Dec 2018
Category:
Save £100 on your open challenge registration fee* with our Advent Offer! Get exploring...
READ MORE
30 Nov 2018
Category:
To celebrate our favourite time of the year, we're holding an Advent flash sale! Treat yourself and tick an adventure off your bucket list.
READ MORE
26 Nov 2018
Category:
Challenge Inspiration
The Great Wall of China is made up of from a series of walls, watchtowers and fortresses, built over hundreds of years. But when exactly was the Great Wall of China built?
READ MORE
22 Nov 2018
Category:
Our incredible Black Friday sale is now on! We’re offering discounts of up to 50% off registration fees across our 2019 & 2020 adventures* - so there’s never been a better time to sign up!
READ MORE
06 Nov 2018
Category:
Challenge Inspiration, Training and Preparation
Ben Nevis is the highest mountain in the UK and attracts over 100,000 people every year. Are you interested in hiking to the summit of The Ben? Find out which route to take to the summit...
READ MORE
02 Nov 2018
Category:
Challenger Stories
Recently our Charity Account Manager, Dan took on a lifelong dream and trekked to the roof of Africa on our Kilimanjaro trek. Read all about his incredible experience!
READ MORE
01 Nov 2018
Category:
Challenge Inspiration, New Destinations
Kerala is a stunning region in south India. Home to impressive scenery, the world’s highest tea plantations and miles of tranquil backwaters. Here are our top five things to see and do in Kerala.
READ MORE
19 Oct 2018
Category:
New Destinations
Unite and Bike Against Cancer Returns in 2020, and this time we are heading to stunning Kerala, India! Unite and Bike is a fantastic cycle challenge for the cancer charity of your choice!
READ MORE
12 Oct 2018
Category:
New Destinations
Check out our brand new 2019 UK trekking challenges! From trekking Snowdon at night to conquering the three highest peaks in the Yorkshire Dales, join us on an exciting UK adventure.
READ MORE
05 Oct 2018
Category:
Challenge Inspiration
Join us on a European adventure as we take to the saddle on one of our European cycle challenges!
READ MORE
01 Oct 2018
Category:
Challenger Stories
Our London to Paris - Tour de France Finale Challenge is one of our most popular cycling challenges! Read all about the experience of one of our participants here.
READ MORE
20 Sep 2018
Category:
Challenge Inspiration
Are you looking for a new challenge? It’s time to discover your next adventure with Global Adventure Challenges!
READ MORE
19 Sep 2018
Category:
Training and Preparation
Find out how to prepare for your Everest Base Camp Trek. Here are our top training and preparation tips for hiking to the foot of the world's highest free standing mountain!
READ MORE
18 Sep 2018
Category:
Challenge, Challenge Inspiration
We're offering incredible discounts on some of our favourite adventures - check it out!
READ MORE
10 Sep 2018
Category:
Challenge Inspiration
Find out what there is to do in the stunning Alps region – the adventure hub of Europe. From hiking around the Mont Blanc region to visiting stunning alpine lakes and glaciers!
READ MORE
06 Sep 2018
Category:
TrekFest
TrekFest 2018 was our most successful trekking challenge ever. Find out what our TrekFest conquerors have to say about our ultimate trekking challenge!
READ MORE
28 Aug 2018
Category:
Challenge Inspiration
Mount Toubkal, the highest peak in Atlas Mountains, is a popular trekking destination. Find out how hard it is to climb to the roof of North Africa – the perfect trek for your first charity challenge!
READ MORE
23 Aug 2018
Category:
Challenge, Challenge Inspiration
A big welcome to Primal Training Club, who will be joining us for our Kilimanjaro Trek in October 2019 in support of Rare Studios, a Liverpool-based performing arts school and registered charity!
READ MORE
21 Aug 2018
Category:
Challenge Inspiration
Is hiking to Everest Base Camp or exploring the stunning Annapurna Region of the Himalayas on your Bucket List? It’s time to make your dreams a reality!
READ MORE
17 Aug 2018
Category:
Challenge Inspiration
Our London to Paris - Tour de France Finale is the ultimate cycling adventure. Find out why you should join Global Adventure Challenges in 2019!
READ MORE
14 Aug 2018
Category:
Challenge Inspiration
Discover everything you need to know about Everest Base Camp - where it's located, how long it takes to trek to and how difficult it really is to reach!
READ MORE
14 Aug 2018
Category:
We're excited to be shortlisted for the award for Business of the Year (11 - 50 employees) at the Cheshire Business Awards!
READ MORE
14 Aug 2018
Category:
Challenge Inspiration
Discover how you can explore this incredible UNESCO World Heritage Site by foot and discover some of the most dramatic countryside in England!
READ MORE
06 Aug 2018
Category:
Challenge Inspiration
Discover how long it will take you to reach the summit of this iconic mountain and which route you should take on your Snowdon Trek!
READ MORE
03 Aug 2018
Category:
Challenge Inspiration
Find out what people are saying about our 2018 London to Paris - Tour de France finale cycle challenge!
READ MORE
31 Jul 2018
Category:
Training and Preparation
Find out exactly what you need to take with you on your Ben Nevis Trek! Famous for its unpredictable weather - Make sure you are fully prepared before you climb the UK’s highest mountain.
READ MORE
25 Jul 2018
Category:
Challenge Inspiration
To celebrate National Park Week we are taking a look at our UK charity challenges that explore our stunning National Parks.
READ MORE
06 Jul 2018
Category:
Challenge
Find out all about our London to Paris Bike Ride route, as we cycle from capital to capital on this fantastic charity challenge!