Muscles can't be practiced every day. Generally speaking, under the theoretical premise, it takes at least 24-72 hours or even longer for muscles to recover after high intensity or heavy exercise! We know that bodybuilding is different from other sports. Bodybuilding is a sport that specializes in training and stimulating muscles. In the process of exercise, it is more important than other exercises to fully tap the endurance of muscle fibers, fully stimulate muscle fibers, increase muscle cells and thicken muscle fibers. So don't think that the rest of the fitness training class is "lazy". Theoretically speaking, rest is a good opportunity to grow muscles! In other words, the muscle building process of bodybuilding is completed during rest.

Therefore, you must rest after training! As for the length of time, it varies from person to person and from place to place. Some people are born with good quality, regardless of the size of muscle groups, just rest for 1-2 days. Some people are panting after 2-4 days of intensive training, which will lead to overtraining. According to the location, the general muscle groups such as chest and thigh are large muscle groups, which generally need to rest for 24-72 hours. Humerus 2 and 3 belong to small muscle groups and can rest for 24-48 hours.