A squat is what is a called a multiple muscle exercise, it will exercise all the muscles in your thighs but particularly the hamstrings and your backside, squeeze your backside as you come to a standing position to emphasize your rear. There all sorts of different exercises you can do like plies(multiple muscle), lunges (more emphasis on the front of your thigh), leg lifts but if you go down to your local newsagents and have a look at Rosemary Conley's magazine, she has a nice little routine in there this month, The Jeans Workout, have a look at it and see if you think it's interesting.