King of exercises
 

Sometimes called the "King of Exercises," the squat develops a strong, powerful lower body, while activating every leg muscle—even your calves have to flex to help you drive from the bottom. Better still, there are dozens of variations like the goblet squat or the overhead squat to emphasize speed, coordination, or strength. Also, because it lights up so many muscles, your body will produce more growth hormone to repair itself and build more fibers.