Start in a push-up position with hands under the shoulders and the legs straightened directly behind the body about hip-width apart. Squeeze the thighs and glutes while straightening the right arm and pressing it into the floor. At the same time, lift the left hand up and twist the hips and shoulders to raise the left arm up towards the ceiling. Bring the left arm down, press the left hand into the floor, and twist the hips and shoulders to alternate sides, lifting the right hand into the air. Repeat for the desired number of repetitions.