At present, many middle-aged people have two understandings of fitness: one thinks that walking fast every day can meet the needs of fitness. Another point of view is that exercise means panting, sweating and improving cardiopulmonary function. Fast walking is a safe and effective way of fitness, which mainly exercises cardiopulmonary function, but it is not enough for people over middle age. Middle-aged people can exercise more if they have the conditions, and it is best to add some strength to exercise. Because middle-aged people's physique is declining year by year, muscle strength is declining, which will affect motor function. Stretcher, lifting dumbbells, doing push-ups, sit-ups and squats are all good forms of strength exercise.