I love it when they have one little leg out.

Yes and they put their little arms out in front of them and stretch!

This is my “im bored and grumpy and i love being bored and grumpy” face.

I assume the cat is just being a cat, though.

Long cat is long

Maybe I’m wrong but it feels like their most relaxed, trusting state. Only surpassed perhaps by being on their backs all stretched out. But yeah, seems like a very happy position.