It’s Monday morning, and I drag my groggy self out of bed to go to the gym. I have 15 minutes to get to my yoga class, and I’m still insanely tired. So I run by the dining hall on my way to the class and pick up a coffee. As I’m walking to the gym, coffee in one hand, water bottle in the other, I wonder if drinking coffee before exercising is a bad idea. I already know that the notion that coffee dehydrates you is a myth, but I know nothing about the effects of caffeine on exercising.