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4. High knees

Standing on a flat surface with feet hip-width apart, comfortably jump on one foot, lifting your knees as high as possible. Let arms flow with the motion of the opposite knee. Alternate legs for one minute at maximum speed and drop to the floor into the straight-arm plank. Perform spider mountain climbers for one minute, alternating movements on each side with the knee to elbow, back into the straight-arm plank. Rest for 30 seconds and repeat 3 times.

 

 

 

NEXT: Build strong abs with these Pilates moves.