Exercise is a means for obese people to lose weight. However, obese people should pay attention to protecting their knees during exercise to avoid damaging bones and muscles. Everyone will wear knee joints when exercising and walking, but they can recover themselves after rest. However, obese people are heavier, and the pressure on their knees during exercise is higher than that of ordinary people. They are more likely to wear out joints than ordinary people, leading to swelling and pain of ankle joints and inflammation of knee joints. Therefore, obese people should reduce squatting, skipping rope, running and other sports that make the knee joint press. This kind of exercise produces several times the pressure of standing, which causes serious pressure on the knee joint. It can be changed to swimming, cycling, etc. At the same time, pay attention to training thigh strength to share the pressure of knee joint.