We've all been there: obsessed with one specific workout, whether it's a so-hard-it-hurts HIIT class, a makes-your-bod-rock Pilates class, a zen-AF yoga class, or a regular run. It's not always ...

HIIT classes are hard, no matter the studio. Even another instructor taking the class mentioned how difficult this one was. But, because all the reps are broken up into short sessions, it felt ...

really discouraged and exhausted because I was pushing my body so hard, and I was not getting to where I wanted to go.” At the time, Fisher was often doing multiple HIIT classes per day.