25 Exercises You Should Be Doing If You Want a Stronger, Firmer Butt

This exercise-ball move is great for working the core, too.

• Lie flat on your back and place the ball under your heels, with your knees slightly bent.
• Press heels firmly into the ball to raise your hips off the ground, coming into a bridge and actively squeezing your glutes as you lift.
• With control, slowly release your bum back down to the floor. This counts as one rep.