The key points of the double under are body position, hand position and timing. When you jump your body should stay tight and straight and your wrists should spin the rope. Your head and body go up and your hands go down. Any movement about the spine, legs, or arms is inefficient and should be eliminated.
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Workout:
"Elizabeth"
21-15-and 9 reps of:
Clean 135 pounds
Ring Dips
