Why do people need exercise to have muscles? Why do animals have muscles without exercise, such as tigers and cows.

Part of it is heredity. The natural muscles of tigers, cows and other animals have high content of protein, which is easy to show.

Part of it is exercise the day after tomorrow. Compared with the 5600 Jin of tiger and cow, people's weight is still too light. Imagine that if you walk with a load of 5600 Jin every day, the exercise effect is absolutely invincible.

In addition, if animals want to survive and avoid enemies, they must evolve strong bodies. Humans use the brain the most, so they tend to evolve the brain rather than the body in the process of evolution.

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