I took a sweat test at Gatorade's elite sports lab. It revealed 3 hydration mistakes I was making.

The Gatorade Sports Science Institute offers exercise testing for elite athletes. I put my sweat to the test as an amateur roller derby athlete. Clark Hodgin for BI "It's HOW hot in here?" I'm no stranger to sweating. As a competitive roller derby athlete, I spend hours a week racing around the track and smashing into my friends (and rivals), often amid sweltering NYC summers. But this time, I was locked in, literally harnessed to a giant industrial-looking cardio machine at the high-tech Ga...