Free app for Android and iPhone

Science in Sport 22k Isotonic Challenge

Run to win a Garmin watch, SiS nutrition and more - with 6 free gels to fuel your challenge

Challenge Ended: March 21, 2019
As the creators of the world's first Isotonic Energy Gel, Science in Sport are dedicated to fueling athletes. That's why there's at least 22 grams of carbohydrates in all SiS energy gels--so you run out of road before you run out of steam.

Kickstart your spring training by running 22km between March 8th and March 21st and receive an exclusive gift from Science in Sport, along with a chance to win 1 of 10 Garmin vívoactive® 3 Music watches.

All participants can fuel their challenge with a free 6 pack of GO Isotonic Energy Gels with their next order over £10/$10/€10

Visit to learn more about our full range of sports nutrition products. Join the Science in Sport Global Run Club to stay up to date on training tips and tricks.
  • 74,187
  • 3,819,666
    Total Kilometers Run
Science in Sport 22k Isotonic Challenge logo