The Bridge-Up.
Lay on your back with your knees bent and your feet planted firmly on the floor. Press your hips up to the ceiling and squeeze those glutes, much like you would while doing a gymnastics bridge. Slowly lower your hips back to the floor and repeat as many times as you can. This is serious ab, butt, and leg toning.
The Bridge-Up with Leg Lifts.
Take turns extending one leg at a time as you push up into bridge mode. Keep your extended leg as straight as possible for maximum toning.
This is a good list of exercises for the glutes – and the example photos show good form. Nice job! If you're interested in more exercises for training your thighs and butt, don't forget single-leg moves like lunges and step ups too.