When we watch videos about nature, we will find that popular science programs like Some People and Nature will introduce us. In fact, some animals look fierce on the surface, but in fact they have little time for activities in their daily lives. For example, tigers, lions and leopards are fierce beasts, but in daily life, their activity time is about an hour, and the rest of the time is actually resting or sleeping. Gorillas and kangaroos actually look very kind, and they are often found in zoos, but they are actually very aggressive.

Secondly, for gorillas and kangaroos, their usual activities are just going out for a walk. As we all know, kangaroos have strong jumping ability. Even though they never exercise, in daily life, because their jumping ability is naturally developed, their innate genes are very good.

Therefore, even if you don't exercise, a part of your body will be made up of muscles. For nature, there are some things that science cannot explain. For example, from birth, kangaroos have shorter forelegs and longer hind legs, which are all determined by genes. So things like muscle strength are actually related to innate genes.

Finally, in fact, gorillas are the same. We all know that our ancestors all said they were apes, but gorillas actually have similar genetic matches with us today. However, gorillas are not as complete as us. They will have all kinds of thick hair, and their muscle strength will be high from birth.