The idea of a squat seems easy enough—you’re basically just sitting without a chair, after all. The reality, though? No matter if you’re a seasoned pro or a total newbie, performing the booty-boosting exercise properly can be insanely difficult. But thanks to one expert-approved modification, mastering it is about to get a least a bit easier—and all it takes is an OG piece of gym equipment.

Celebrity trainer Simone De La Rue, who regularly works with the likes of Jennifer Garner, Reese Witherspoon, and Lea Michele, recently shared her trick for achieving a flawless squat using a big exercise ball. “Using a ball against the wall is a great way to perfect your form and alignment,” the Body By Simone founder writes on Instagram.

“Using a ball against the wall is a great way to perfect your form and alignment.” —Simone De La Rue

After finding some wall space to perform the assisted sit, stabilize the ball between your back and the wall, then slowly lower into a seated position. “Make sure to keep your knees over your ankles,” De La Rue says. “If you have the luxury of having a mirror nearby, check your profile to keep your butt higher than your knees. Then as you stand up, contract your glutes at the top of your range.”

To amp up your strength using the ball-to-the-wall technique, De La Rue recommends also adding in some eight-pound weights and practicing three different exercises that’ll give you a full-body burn—quads, hamstrings, glutes, and lower abs, included. Before you know it, you’ll be a squat champ and have the behind to prove it.

Try 3 ball-assisted wall squat exercises from Simone De La Rue.

1. Weighted wall squat

How many: 3 sets of 10 to 12 reps

2. Weighted squat with bicep curl

How many: 3 sets of 10 to 12 reps

3. Weighted squat with frontal raise

How many: 3 sets of 10 to 12 reps

Here’s why Simone De La Rue wants you to go makeup-free. Or check out her three-part plank series that will fire up your core from every angle.