Stand in chest deep water. Knees are slightly bent with a belt wrapped around your knees. Press your knees outwards against the belt and contract your stomach muscles lightly.
Swing your arms alternately forwards and backwards in small quick movements, making sure both hands move as far in front of the body as behind. Palms are always facing the direction of motion.
Increase speed and/or use paddles to increase resistance. Perform both small and large movements.
