Mistake #9: Doing Long Workouts
I thought signing up for a half-marathon would motivate me to stick with consistent workouts, but the long training runs completely drained me for the rest of the day.
This also goes along with exercising too much, as Jacquelyn mentioned, which can raise cortisol levels, and increase hunger. Feeling tired and low-energy just made me crave sweets. And because I was working out so long, I felt like it gave me the liberty to eat whatever I wanted. By the time I got to the half-marathon, I had gained weight, and it wasn't muscle.
What's worse is that working out too long can actually cause your body to become catabolic (breaking down muscle tissue) explained NASM-certified trainer James Shapiro. "When that happens, you stunt the recovery of your muscles and in turn become weaker from workout to workout. My best advice is to stay within an hour to an hour and a half with your workouts."