Although male kangaroos do appear to flex their muscles to show off their impressive figures, researchers in a 2013 study said it is not currently possible to determine whether or not such behavior is ...

DOES Mario Lopez suffer from biceps envy? This Disease of the Vain usually strikes hunky guys who come into close contact with even hunkier guys. They see a set of biceps larger then theirs, and they ...

Curls are the classic gym bro exercise, and a bicep flex is the most iconic way to, literally, flex on someone. But does it matter what type of curls you do? And are there non-curl ways to get some ...