How should old people keep fit if they want to live longer?

　　In people's eyes, running has always been associated with legs. But for the elderly, the quietly emerging "arm running" is very suitable. As the name suggests, arm running involves exercising your arms. exercise method to replace running. Research shows that arm running has the same fitness effects as running. Exercise for the elderly uses arms instead of legs, which is gentler, not restricted by the venue, and has no risk of injury. It is easy to learn and master.
　　
　　The specific methods of arm running exercise are:
　　
　　1. Hand movement: The first thing you do when you get up in the morning is to move your fingers and swing your arms and wrists, like playing with a fitness ball or doing hand swings, to promote blood circulation. You can do this for 1-2 minutes.
　　
　　2. Rider: Lie flat on your back, straighten your arms upwards, as if turning the pedals of a bicycle with your hands. You can do this for 1-2 minutes.
　　
　　3. Fly: Stand, stretch your arms to both sides, and slowly wave your arms like a bird flapping its wings. Do this for 1-2 minutes.
　　
　　4. Hit the sandbag: Imagine there is a sandbag in front of you, hit it with your fist, or box with an imaginary opponent. You can do this 10-20 times.
　　
　　5. Throw the ball: Take a ball and throw it into the air and catch it when it falls, or let the ball bounce on the ground or wall and catch it back. If there is no ball, you can also make a gesture of throwing a ball, do it 10 times with each arm, and then do it 10 times after resting.
　　
　　It should be noted that before arm running, you must first move your fingers, swing your wrists and arms to promote blood circulation. Secondly, when the elderly are doing arm running, they are not allowed to increase the intensity of exercise or extend the exercise time at will.
　　
　　Because arm running, as a mild exercise, is based on aerobic exercise, during the entire exercise process, the body is fully supplied with oxygen, and the decomposition of sugar and fat is carried out in an aerobic state. This can reduce "active oxygen" and other harmful substances, thereby achieving the purpose of prolonging life.