First is the water resistance. Because the water is a thicker medium than air, the resistance from the water can range from 4 to 44 times that of movement out of the water. Using the resistance in the water is like exercising with weights or machines on land, and much safer.
Second, is the water buoyancy. In chest deep water, approximately 80% of your body weight is buoyancy, allowing you to only bear 20% of your weight when you exercise. See more...
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