I think they just look like that sometimes. I found a lot of images of tigers with significant definition until finding one I could identify.

This is Luca, and his profile doesn't say anything about a medical condition.

https://www.carerescuetexas.com/meet-the-animals/tigers/luca.html

You can see videos of the cats here:

https://m.youtube.com/@bigcatderek/videos

I think the lighting angle might be doing a lot of the work in the OP image.

e: I actually just want to share some tiger pictures because I like them.

Probably not AI because there is an image match of this from 5 years ago.

every once in a while my fluffy kitty looks absolutely jacked (not to that extent, but super muscly) and she weighs like 10 pounds. runs around all fuckin day chasing greebles.

That has to be painful for them, right? My first instinct was to laugh but then I thought maybe that'd be mean to YACKED KITTY-BEAR

They sure do, which is why we have to maintain self-control.

According to e216, they don't...

The primary cause of hypertophy is mechanical tension, which is achieved by creating resistance against a muscle's force. Flexing is an isometric exercise, but doesn't provide much tension and therefore doesn't stimulate a lot of muscle growth. Climbing offers a ton of tension, both isometrically by holding up your body weight and isotonically by pulling up your body weight. Climbing is usually significantly anaerobic and will damage muscle fibers, which are two other stimulants of muscle growth.

Cardiovascular exercise is good for strengthening heart and skeletal muscles, but not for getting swole. If combined with good diet it can help reduce body fat percentage to achieve a more cut appearance.

furry =/= zoophile

Start with something small, being fit is not just about being jacked. After being like you, I've taken up the challenge of doing 10k pushups this year. It might sound like much but it only comes to around 30 per day. You just have to be consistent. I'm on day 84 today and have only missed one day so far. I have begun adding skipping a rope on days that I can. I'm already seeing improvement in my posture and back ache and that alone keeps me motivated.

My motivation was this post: https://wjgilmore.com/articles/10000-pushups

You can do it too. I believe in you.