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Certified Pilates instructor Lisa Johnson loves this thigh-toning move because it's nearly impossible to cheat! "Because of the roundness of the ball, you have to 'clamp' down in the right way, which ensures that you're really focusing on the inner thigh," she says. "I also love that you never get too strong for it—just squeeze harder and you'll keep feeling the training effects."
To do it: Place a squishy ball or pillow between your legs and lie on your side, arm cradling head and knees bent. Inhale and on the exhale, press the top knee down with force into the ball and hold for 4 counts. Inhale to release. Do 12 to 15 reps; repeat on the other side.
16 top fitness experts share their go-to move for slim, sculpted hips and thighs
16 top fitness experts share their go-to move for slim, sculpted hips and thighs.