Shawn Arent, the director of the Center for Health and Human Performance at Rutgers University and a Fellow in the American College of Sports Medicine, explains the mistakes that people make when they're trying to get bigger muscles.
Follow TI: On Facebook
MORE: Bats aren't as creepy as you think — here are 5 of the coolest species
UP NEXT: The Amazon rainforest might catch fire this summer — here’s why that could be devastating