Board Press Down Alternating

Stand with your back against the pool wall with feet shoulder width apart. Move your feet slightly away from the wall.
Keep toes facing forward and bend your knees so that you are in a partial squat position. Pull your abdominals in and keep your back flat against the pool wall. While maintain this position, press the board down approximately 1 inch with your right hand. Hold for 1 second and then return to starting position. Repeat for left side.