This move firms your butt and works your abs and hamstrings too.
Fat burner. Come down on all force and raise your left knee out to the side. Now, extend your legs straight back so your toes and hip are in a straight line. Now, bend your knew and lower your leg back down. You'll do 16 reps. Make sure not to arch your back throughout the exercise. Now, switch sides, raising your right knee out to the side. Extend your legs straight back. See your toes and hip are in a straight line, making sure not to arch your back. Now, bend your knee and lower your leg back down. Repeat the move on this side for another 16 reps. This move works your abs, hips, and hamstrings.