Low-intensity long-term exercise is the best exercise for the elderly to lose weight. The old man suggested that it is best to walk for a long distance, and insist on walking for more than half an hour every day. The speed depends on the old man's physique. If you are in poor health, your speed will be slower. Wait until the old man's physical condition improves and then slowly speed up. Or walk 10 mile every day, gradually speed up, and within the range that the body can bear, with the goal of walking in the shortest time.