This killer workout specifically targets your glutes, quadriceps, hamstrings, calves and cardiovascular system! Exercises in this workout such as squats also create an anabolic environment, which promotes body-wide muscle building. This is perfect for building muscle and burning fat (i.e toning!!) Warm up: As a warm up, go though the movements in this circuit using only body weight at first, and then gradually build up to the weights you are going to be using for the circuit