Sumo Squats or Plies are awesome for your lower body strength but also to stretch and open up your inner thighs. Press your knees as far apart from each other as you can. Go as low as you can, but maximally to where your hips are in line with your knees. Press strong through your heels to come back up to your starting position. An extra challenge would be to hold a dumbbell with both hands at your chest.
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