The best time to exercise for the daily morning and dusk, because the air is fresh at sunrise every day, dusk oxygen is sufficient, the most suitable for exercise. But now the air pollution is more serious, combined with the environmental conditions, outdoor exercise to 10:00 am or 3:00 pm or so the best. Proper exercise not only relaxes the tension, but also breathes high-quality fresh air, while receiving sunlight to promote the development of the skeletal system and enhance resistance. If you do not consider the impact of the environment, the best sunrise and dusk time exercise, but now the city air pollution is more serious, combined with air quality and other factors, it is recommended that 10 a.m. or 3 p.m. outdoor exercise, the air quality is excellent and sunny, more conducive to physical health. People should exercise before the appropriate warm-up exercises to prevent excessive exercise intensity caused by muscle strains and so on. In addition, exercise should be carried out one hour after meals to avoid unnecessary damage to the stomach.