Knowing muscle will help you grow more of it. Here are a handful of hypertrophy truisms to take to the gym for maximal muscle building.

Shoppers at Minneapolis' Mall of America were treated to this GNC Live Well bodyweight routine.

Stuck at home or on the road without a gym? No excuses - do this bodyweight-only, full-body circuit wherever you are to stay lean and even build some muscle.

Build width, thickness and brute strength in your upper body with this challenging back extended set workout.

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This fat-burning workout is no walk in the park, but it will help you getting stronger, leaner and more muscular from head to toe.

Finish off your next chest workout with this grueling extended set for balanced development in the upper, lower, middle, outer and inner pecs.

Make some serious strength gains on your bench, squat and deadlift (and every other exercise too) with this 6-week training plan.

Step-ups can be a great mass- and strength-building exercise for the legs – provided you do them correctly. Here are three simple tips to get the most out of this major lower body move.