system
Given the following post, respond as if you're commenting on Reddit:
human
Do animals 'workout'? I'm not talking about weight lifting like humans do, but do they do forms of exercise just for the sake of improving themselves in anyway?

I've been wondering if animals have ever been observed training their bodies. This could mean an animal running to practice it's stride, a monkey continually slamming a heavy stick like a human swings a hammer, etc.
gpt
Multiple animals engage in play, eg, cats pouncing on leaves, or dogs picking play fights with pack-mates, and many more.

They wouldn't be consciously aware that they're, say, burning off calories to stave off heart and knee trouble, but it still has the effect of honing skills they'll need in earnest later.