You can swim to lose weight. Swimming is the exercise with the least pressure on joints, and it has little pressure on knee joints when you are fat in the water. Personally, I think this is the best way for obese people with joint injuries to exercise to lose weight. Before swimming, you must warm up to move your joints and knees. This will allow you to swim for a long time, and the intensity of exercise will continue to increase. Stick to it for about a year and you will definitely lose weight. It is worth noting that if the water temperature is too low, the human body will instinctively store fat, which is not conducive to reducing fat. It is necessary to choose relatively warm water. There is also that swimming is mostly cold and tastes good. Be sure to control your appetite when eating!