When you are carrying a couple of extra pounds most forms of exercise, particularly weight-bearing exercise like walking or jogging can be too difficult or painful. Swimming on the other hand, is not weight bearing because the water supports the body weight. This means that there is no excess pressure on the joints and you can enjoy a pain-free and effective workout. Also because swimming is so technically demanding, it is often the case that the less proficient you are, the most energy you will expend traveling very small distances. In other words, the poorer your technique, the more energy you burn and the more weight you lose. At last, an activity you don’t have to be good at to lose weight!