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Warning: You'll feel the burn for days (and days) after you do this exercise from LA-based celebrity trainer and fitness expert Stephanie Vitorino.
How to do it: Start seated with your right knee bent directly in front of your hip and left knee bent behind your left hip. Rotate your torso and place your hands on either side of your right knee. Brace your core as you lift your left knee and foot off the floor, keeping your chest lifted. Keep your left leg lifted and extend to kick, leg parallel to the floor. Bend your left knee back in and release it to the floor. That's one rep. Do 15-20 reps on each side.
Training tip: If lifting your knee is too challenging, start by just lifting your foot and then add a side kick when you're ready.
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