The best way to strengthen any muscle group is to increase the weight being pulled, one way is simply placing this Pull Buoy between your knees allows your arms to pull your whole weight through the water.
Pull buoys are buoyant pieces of foam held between the thighs while swimming. Pull buoys keep swimmers' legs and hips at the surface of the water, allowing swimmers to stop kicking and concentrate exclusively on pulling and body rotation technique. Since pull buoys isolate the upper body, they also help swimmers increase arm strength.
Great for doing muscle conditioning, endurance training, and many other fitness activities.
Dimensions: 8.75" x 4" x 4.5"
This is not a lifesaving device. Do not leave children unattended while this device is in use.