One: whether to go to the gym or to exercise outdoors can be decided according to the preferences of the exerciser, the weather, the air quality and the physical quality of the exerciser. If the weather is good, the air quality is good, and the exerciser is healthy, it is suitable to choose outdoor sports. If the weather is bad, the air quality is poor and the exerciser's physical fitness is poor, you should choose some simple exercise methods in the gym to exercise.

Two: When the weather is good and the air quality is good, the exerciser should do proper outdoor exercise and exercise in the fresh air in the morning, which is good for the respiratory system. Exercisers with poor physical fitness should exercise properly according to their own endurance, because there are many factors that aggravate their illness outdoors, which is not suitable for outdoor exercise.