Start in a push-up position with the hands shoulder-width apart and the legs straight out directly behind the body about hip-width apart. Push the toes of the left foot into the floor and squeeze the left thigh and glute while moving the right knee forward to the outside of the right elbow.
While the right leg is forward, push back through the left heel to straighten the left leg. Then straighten the right leg and bring the left knee forward to the outside of the left elbow while reaching forward with the right hand. Alternate this arm and leg action for the desired distance.