There are differences. The appearance is different, manual workers rarely have large muscles, which are more uniform and smooth, and the skin has high gloss. Fitness people are all massive muscles, protruding and paying attention to lines, probably because the gym is a single muscle block training, and manual workers will be more evenly distributed. You can observe the figures of dock porters and fitness enthusiasts.

A lot of physical strength is continuous exercise, while gyms are dotted around. After you finish practicing, go to rest or have the next exercise. Good practice and high acceptance intensity.

The difference is that the aerobic ratio of manual labor is higher than that of gym, so there are more capillaries and better persistence.

The proportion of anaerobic exercise in gym is higher than that of manual labor, with more mitochondria and stronger explosive force.

Personal experience: When learning to be a bully, it is more and more difficult to take a few minutes to exercise after class. As a result, as a bookworm who seldom exercises, his strength is stronger than many people who need to spend some physical strength, which is why.