[Asa Willow]

Did a lil body outline, I'm a little rusty on cats so bear with me!

So the main thing I noticed is the hind legs. In most mammals, and even many tetrapods, the hind legs are sort of made of three lines/parts. The thigh, the shin, and the heel. (Shown in black)
These form a sort of lightning bolt zigzag thing. In cats, their thighs and shins are actually longer than the heels by quite a bit. The femur and tibia (thighbone and shinbone) are about equal in length, but the heel is actually quite short. This part and the paw make up what on us would be the foot, so basically cats walk on their toes.

Much of the same logic can be applied to the front limbs. The shoulder is the first bend of the zigzag, and the second bend is the elbow. Their wrists are towards the bottom, but aren't easily visible on cats so I didn't bother with them.

Another thing to note is that their elbow should be right around or just below their stomach. Since cats, like other mammals, have rib cages, their torsos are actually a bit thicker than a lot of cartoons show them to be, and they don't really taper in like a dog's, because cats are actually quite baggy.

Hope this helps!
I left the head alone because that's generally more of a stylistic thing, but all styles can improve from anatomical references!
I and many other artists recommend using references to start out, and then base your style off of what you know from life.

Hope this helps!

[the folly of man]

I'll definitely try this! thank you!

the way I sort of make them less 'baggy' is more of a style thing, but it could probably still be improved c: thanks again!

[Asa Willow]

Ye I totally get the style thing too, it's fun to make them look sleeker for sure