For the butt and thighs, Peeke recommends squats. A simple way to do these is to squat against a wall or an exercise ball, into an invisible chair. Keep your feet hip-width apart, knees over your ankles, and squeeze your abs to avoid arching your back. As you become stronger, you can hold dumbbells to increase the intensity. Aim for 3 sets of 8-12 repetitions.
Note: If any exercise doesn't feel right, stop and check with a fitness pro. Depending on your condition, some exercises may not be recommended.