One hour of water training burns up to 1,000 calories and tones the muscles in less time. In addition, the low impact of water on muscles and joints reduces the risk of injury. The multiple disciplines and routines created to train in water, especially in centers or gyms with swimming pools, aim to combine the benefits of fitness and the aquatic environment. One of the keys of its greater effectiveness and lower level of impact is that the weight of the body is reduced by almost 80% in the water. This allows greater freedom of movement and the execution of postures or exercises that, out side the water, could lead to injuries.