"I'm not as flexible as I used to be!"
It keeps me flexible. I have inflammatory arthritis throughout my body. My doctor wishes she was as flexible as me, assuming I'm having a good day. I move better than people expect even on bad days. It won't work for everyone, but someone who does not have physical disabilities saying this do me seems ridiculous.
It's not like I track people down and try to recruit them for this. People feel the need to volunteer this information when they see me minding my own business with my hoop. I don't think I'll ever understand telling someone why you can't do something when they didn't ask and you're not actually looking for help or advice.