Squats are a classic exercise to primarily target your lower body, working your glutes, hamstrings and calves. The exercise also works in a similar fashion to a sit up as it pulls on your core and is a real winner if you are wanting to blast some belly fat or target your abs. Typically a strengthening exercise, squats give you a balanced workout to suit a range of fitness needs.
Once you have completed squats, you can add difficulty or push yourself further by performing them with weights to give your full body some much needed attention. To build real muscle, add a barbell to your squat routine and really work those shoulders.