Sporti Aquatic Fitness Light Dumbbells Water Weights Yes, you can tone and strengthen your arms through resistance training even in the water. Just enlist the help of a set of the Sporti Aquatic Fitness Light Dumbbells Water Weights ($15). These light water dumbbells have a resistance weight of around four pounds and are made with a foam that won't absorb water. Image Source: swimoutlet.com Sporti Aquatic Fitness Light Dumbbells Water Weights $15 from swimoutlet.com Buy Now