Old people must do what they can and choose the equipment that suits them. In particular, some elderly people with special diseases should pay more attention to sports safety and avoid injury. Spacewalk: Focus on preventing falling. Spacewalkers have little resistance. Some old people can't control their movements because of poor coordination, and may fall down. Some elderly people swing their legs back and forth at the same time, which is easy to lose their center of gravity. In addition, excessive swing may cause muscle strain. Therefore, when the elderly exercise, they should hold the handrail tightly with their hands, keep their upper body straight, stand on two pedals with their knees slightly bent, keep their center of gravity stable, and then naturally swing their legs back and forth alternately, just like walking with big strides. This walker has a small load, and the elderly need to combine other aerobic training methods to better play the role of exercising cardiopulmonary function. Pedal device: prevent knee joint strain. Pedals are mainly used to exercise the strength of lower limbs. Because the angle of the instrument is fixed, if the knee flexion and extension is unreasonable, the force line of the lower limbs is improper, and the amount of exercise is too large, it will increase the burden on the knee joint and cause patella softening. Therefore, when the elderly use pedals to exercise, they should pay attention to the fact that the flexion angle of the knee joint should not be too large, and the knee joint should be aimed at the tip of the second toe, and exercise moderately according to their own sports ability.