Why does the body require a period of rest after intense activity

For example- if u work out ur arms for a week straight without breaks, u should most likely take the next week completely off for the body to heal an to come back stronger for the next week u work out, most likely beneficial to ur overall health to perform better/take breaks an to gain bigger muscles, hope this helped :)

1.)dr. natterson- horowitz came to realize that their isn't much of a difference between animals and humans. just like humans, animals can suffer from illnesses and diseases like breast cancer, self injury, anxiety, and many more. she also discovered how they even treated and performed surgical procedures on animals just as if the animal it self were human. the los angeles zoo called dr. natterson- horowitz because they knew that she was a doctor and that  she would be able to recognize what was wrong with the gorilla. they knew that humans and gorillas were similar, so instead of calling another veterinarian, they called a doctor.