With our heavy leg day out of the way already (remember Day One's 5X5 squats?!), today we are working on leg muscles with explosive energy. We're shaping our legs for the look we want using lighter weights, higher reps, and a circuit-style format. Make this workout feel a little like cardio by keeping your pace fast and transitions quick. As always, keep your form on point.

Whew those jumps! They get me every time! A tip for an extra challenge or more cardiovascular-challenging workout, perform jumping lunges instead of weighted walking lunges.