I am an avid Ice Hockey player and Mountain Biker and have been using GU Gel and a variety of sports drinks for sustained energy. I noticed a significant improvement in my energy level and duration. Both e-Gel and e-Fuel provide energy that doesn’t feel like a rush like other products produce. I have also noticed that I don’t crash after a hockey game or mountain bike ride like I did on other products. Plus, I never get a stomach ache like I would with other products. I am telling all of my fellow athletes about how e-fuel and e-gell are much better than any other products I have tried.