If you often go to the gym, or have close friends who happen to be sports lovers, you may find that some people are like this: some people only run, but never participate in strength training; Some people only do strength training and have never seen them take part in aerobic exercise such as running. Therefore, we can see some clues from their body shape and sports performance, such as long-distance runners are thin, while strength trainers are heavy and strong.

Body shape is the result of long-term adaptation to external stimuli.

It says here. External stimuli? , refers to physical exercise. For example, people who do a lot of long-distance running for a long time will inevitably develop in a slim and thin direction. The more professional a long-distance runner is, the more obvious his physical characteristics are. For example, Kenya's excellent middle and long distance runners have slender limbs and thin and light bodies.

Even ordinary long-distance runners, those who can run a full marathon, are very thin. Studies have shown that long-term aerobic exercise can increase the proportion of slow muscle fibers in muscles, which is not only durable, but also more slender.

Strength trainers, in resistance training aimed at increasing muscle mass, can soon see the increase of muscle mass. It will take at least a few years to practice well.

So generally speaking, if a person only does a certain kind of exercise for a long time, then the body will gradually form a body shape that is conducive to this sport. For example, long-distance runners are thinner and strength trainers are more muscular.

What if you only do aerobic exercise for a long time?

In real life, we can really find that many runners never do strength training, and even other aerobic exercises other than running are rarely done, just running blindly.

Judging from the analysis just now, their bodies should tend to be slim, as a whole. However, not every runner is like this. Because there are many factors between running and figure formation, such as personal physical differences, diet structure, exercise intensity, exercise frequency and so on.

Among them, the most influential factor is mainly diet. Some people who run regularly, although they look quite standard and not fat, will find a high body fat rate after measurement, and some people may also suffer from mild or moderate fatty liver. Therefore, people who often do aerobic exercise, if they don't control their diet, may still have a high body fat rate and may not be slim.

Generally speaking, as long as the amount of aerobic exercise is large enough, in the long run, it can still offset the negative effects of uncontrolled diet on fat loss and body shape. Especially when you have enough exercise at a certain stage, for example, you are going to spend a few months to implement a marathon preparation training plan, and aerobic training including running is as many as four or five times at a time, and the weekly running volume is as high as tens of kilometers, so it is almost inevitable to lose weight.

What if you only do strength training for a long time?

We often see this in the gym? Muscle man? . They have big arms, round waist and great strength, but their figure lines are not clear, their body fat rate is high and they look strong. This figure is formed by only doing strength training and not strictly controlling diet. These muscular men usually don't like doing aerobic exercise, and they don't want to spend their time on aerobic exercise like running.

But if you see a muscular man with strong muscles, clear lines and well-proportioned figure, you can be sure that he has invested a lot of training time in strength training, and the amount of aerobic exercise is also considerable.

During the muscle building period, the main content of muscle man's fitness is strength training. Due to the need of excess calories in the diet, the body fat rate will rise and muscle lines will appear. Round? Get up. During the fat-reducing period, they will increase the amount of aerobic exercise. Many muscular men will have their own special aerobic exercise time in the morning and evening to quickly reduce the body fat rate and shape beautiful body lines.

Therefore, a muscular man with a clear figure must be the result of long-term strength training and aerobic exercise. People who only do strength training and don't or rarely do aerobic exercise are mostly strong.

Finally, let's define what it means. Never exercise? ?

In fact, few people really only play one sport and never involve other sports. For example, strength trainers are likely to play ball with friends on weekends. Aerobics exercisers may have to do several months of flat support or belly roll training in order to participate in the sports meeting organized by the company. Others may temporarily stop exercising because of short-term study abroad or business trip.

In addition, even if you are preparing for the marathon, there will be cross-training in the scientific training plan, which will involve the training of leg strength, core strength, coordination and sensitivity. So absolute? Never exercise? , not the norm. In the long run, it will not fundamentally affect or determine a person's body shape.

Boxing is a typical example. Although it looks like aerobic exercise, it is actually a mixture of aerobic and anaerobic training. Therefore, boxing enthusiasts who train all the year round may not have huge muscle mass, but their upper limb strength, muscle lines and fullness are definitely stronger than those of long-distance runners. The main factor that determines their figure is what they mainly practice, not what they don't practice.