Stand with your feet 6-12 inches wider than your shoulders and point your toes outward at around a 45° angle.
Keeping your weight in your heels, slowly lower your bodyweight down. Make sure that your knees do not go over your toes.
Lower your hips until your thighs are at least parallel to the ground (or as close as you can get), then slowly return to a standing position.
With it's deep range of motion, this move tones thighs and butt muscles fast. Because of the large muscle groups involved, it also burns a great deal of calories. Exercises that target the glutes and quads, such as the one in this video, will help you firm up fast and can even serve to reduce cellulite if done regularly.