For the guys out there who are looking to get more buff, resist the urge to only focus on your "T-shirt muscles." I know it's probably tempting to hit the gym every night and only perform a bunch of curls and military presses, but you're actually doing yourself a disservice.

Aside from the fact that an imbalanced physique is at greater risk of injury, focusing only on these smaller muscle groups deprives your body of its full release of testosterone. Because such a large percentage (60 percent) of your overall muscle can be found in your legs and back, working these areas will actually benefit your whole body.

So, the next time you're at the gym, rather than hammering out your umpteenth set of dumbbell curls, try performing some sets of deadlifts and squats. Your body -- even your T-shirt muscles -- will thank you with the muscle growth you've been hoping for.