Strength training usually lasts for half an hour to 1 hour at a time, which may be unbearable for the body after a long time. If you do it every other day and let the muscles rest for 47 hours, the muscle level will return to the original level and it will not grow well. Let's just say that the contribution before fitness strength training will be useless or minimal, which is not what trainers want to see.

Muscle recovery is fast, and mechanical times are few. It is best to do strength training every day. Of course, advanced students can practice every other day because of the increased intensity.

Running is a classic aerobic exercise. On the basis of a certain intensity and duration, it is ideal to run once every other day. Take 5km at a time as an example, it takes about 6,000 steps, and the mechanical movements of the legs are more than 6,000 times, sometimes even tens of thousands of times, giving the knees and muscles enough rest every day.

There are many mechanical movements of muscles, and muscle recovery is slow. The next day's training makes the muscles relax and healthier.