[sidebar]This Pilates move is a variation of the popular glute, or hipe, bridge. The twist: It uses a wall to boost your burn, help you balance, and take pressure off your joints. (Watch the video above to see it in action!) The secret behind the move is that it leverages your bodyweight to tone and sculpt a firm, strong butt. And since the glutes (your butt muscles) are one of the body’s powerhouse muscle groups, strengthening them not only results in a perky-looking rear, but it can help you feel more powerful during your walks and runs.  Pilates expert Erika Bloom shares three variations—easy, medium, and hard—so you can get the most of this exercise at any level. Ready to give it a try? Watch the video to see Bloom demonstrate it with flawless form.