Rabbit resting front paws raised

[WildNightsWithAndyDay]

Hi
My 2yo make rabbit has taken to resting his front paws on a brick in his run. He looks really uncomfortable doing it - ears flat back and hunched. He's eating and moving about ok just looks constantly uncomfortable.

He's not a tame rabbit and finds it distressing to be picked up so I'm reluctant to take him to the vets unless I have to.

Any ideas what (if anything) it could be? I'll obvs take him to the vet if he continues, just wondering if anyone else had this with their bun?

If possible, maybe a photo could help MNers (and the vet if you go)?

Could it be he is hot and the brick is cool. Whatever the reason I think he is doing it because he likes it.

Our bun sleeps with her head in her food bowl. She looks really uncomfortable but must like it.

I hadn't considered him being hot fortified. That could be a very good call as he's only been doing it the last week or so.

Just went out to take a pic and he's stopped doing it. Typical. I'll try again in a bit if the light stays.

My boy rarely goes outside but when he does venture into the great outdoors, he likes to stretch out in the sun, not on the lawn, but on some particularly large sharp pebbles and lean his head on a paving slab. He's an indoor bun and did go through a phase a little while ago of wedging himself behind doors (between the wall and the open door) - looked very uncomfortable, but his choice.