When you have any form of arthritis, on-land plyometric exercises are often off-limits. However, by drastically reducing the impact on your joints, water-based plyometrics allow you to safely train muscle power, Purcell says.
How to: You know how to skip, just do it in the water, from one side of the shallow end to the other. Prioritize big arm swings and exaggerated movements, keeping as much of your body submerged as you feel comfortable. Bring your knees high toward your chest and, as you get comfortable, try to increase how high you pop up.