Mountain climbers

Starting position: Start in the upright push-up position, aka. the high plank position.Hands should be directly under your shoulders.Keep your head in line with your back, facing the floor.Feet should be about hip-width apart. Steps: Move one knee toward the center of your body, towards your elbows, keeping the other leg extended. In a quick jumping movement, straighten the bent leg out and pull the other knee toward your body. Keep repeating step 2, alternating legs. Notes: Throughout the ex...