system
Given the following post, respond as if you're commenting on Reddit:
human
Why does it seem animals not only suffer less muscular/skeletal injuries (with less warming up, stretching, etc) - but when they do suffer an injury seem to heal up ridiculously fast, without the aid of medical treatment?

So basically, why do lions, gazelles, cheetahs, etc never really get hurt despite sprinting all out without warming up or stretching?  To boot, when they do get hurt they seem to heal up even faster than humans can with the added benefit of medical treatment.
gpt
Well, for one, stretching before exercise has been shown to have no improvement on injuries, and may even make some worse. It's purely a (spurious) human development. 

Now, the other thing to note is that animals live harder, shorter lives than we do. Oops, no predators! So remember that you're looking at younger animals usually... and younger humans are quite resilient. In an adrenaline rush, humans can easily shrug off a sprained ankle, and a youngster will heal it to the point of walking (albeit painfully) in less than a week.