Getting Rockette legs
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Jumping squats in second( Ben Torres, For the Chicago Tribune / December 20, 2012 )
Start in a deep grand plie in second position. This is done by placing the feet wide apart with the toes comfortably facing out to the side. There should be no discomfort in the knees. If it doesn't feel right, try angling your feet more toward the corner.
Bend your knees until you've created a 90-degree angle between your hamstring and calf, and keep your bottom in line with your knees. Arms can be straight out to the side.
Explode off the floor by pushing through your feet. Reach the arms up to the sky when you jump. Smoothly return to your turned-out grand plie when you land and repeat.