Start on floor in plank on palms with hands below chest and fingertips forming a diamond shape. Do 1 push-up. Walk hands (keeping the diamond shape) back toward feet, about 5 inches. Do 1 push-up.
Continue walking hands back 5 inches and doing a push-up until body is in a downward dog position for 1 final push-up. (So 3 or 4 push-ups equals 1 rep.)