That sounds really awesome.
However, I'm not sure of how to bring it up so he takes me seriously. He wants his knee to get better, but I have a feeling he's not interested in help. And yet I don't see him making the effort to get his knee back on track. I think he's worried about overexerting it some more. He doesn't readily admit to worrying over anything, so his saying he's concerned means it really bothers him.
Of course, it would be more productive of him to start taking care of business sooner. I really do want to help. I'll even jump in the pool with him. Or stand around the pool in a bikini with a drink in my hand if that's all he wants. Haha. Whatever helps him.