Core plus your upper back and shoulders? Hell yes! Place your heels against the bottom of a wall, bend forward, and position your hands shoulder-width apart on the floor. Walk your feet up the wall until your legs are parallel to the floor and your body forms a 90-degree angle (a); this works your upper back and shoulders. Raise your right leg to activate your core (b). Reverse to return to start. That's one rep. Do 10.
Give your workout some flame . . . aka a booty burner. Here are 5 squat variations for your best butt.