Running before fitness should not be too long and too tired. Should give priority to with warm-up, it is best to sweat slightly. Otherwise, it will consume energy and affect the fitness effect.
It doesn't have any effect on fitness to exercise for two or three hours before running. The interval is too long, which basically just increases the amount of exercise.
Extended data:
Fitness is a kind of exercise, such as all kinds of unarmed aerobics, rhythmic gymnastics, rhythmic gymnastics, and all kinds of self-resistance movements. Gymnastics can enhance the strength, flexibility, endurance, coordination and control of all parts of the body, thus making the body strong. If you want to relieve stress, exercise at least three times a week.
Swimming, brisk walking, jogging, cycling and all aerobic exercises can exercise the heart. Aerobic exercise has many benefits: it can exercise the heart and lungs, enhance the function of the circulatory system, burn fat, increase vital capacity, lower blood pressure, and even prevent diabetes and reduce the occurrence of heart disease.
The American College of Sports Medicine suggests that if you want to know whether the intensity of aerobic exercise is appropriate, you can test your heart rate to reach 60%-90% of the highest heart rate after exercise.
If you want to lose weight through aerobic exercise, you can choose low to moderate exercise intensity and extend exercise time. This method consumes more calories.
References:
Fitness-Baidu Encyclopedia