Unlike other muscle groups, like your biceps, quads, or abs, you can’t exactly isolate the area without other larger, stronger muscles taking over. And because it’s a spot that most of us ladies store fat, you may not see change as quickly as you would like. But one of the all-time best moves to score taut inner thighs is actually a simple one you can easily do, and they are walking lunges.

It’s essentially the same fundamental movement pattern as running, only emphasized. It also sculpts your butt and every other muscle in your legs, including your quads, hamstrings, calves—and, yes, secretly, your inner thighs.

“The main muscle in your inner thighs is the third most powerful hip extensor, behind your hamstrings and glutes,” says Mike Boyle, founder of Mike Boyle Strength & Conditioning in Massachusetts. “Because the walking lunge requires constant hip extension and switching your body weight from one leg to the other, both the major thigh muscles and the smaller ones attached to it kick in to help stabilize your legs.”

To be totally clear, if your goal is to shrink the size of your inner thighs, you can’t spot-train to make fat vanish; you have to lose body fat all over. But performing walking lunges—Boyle recommends adding three sets of 20 reps (10 per side) to every workout—will strengthen the muscles there to help firm up the area, making your