Rollerskating/blading.
I used to be so good when I was younger. I mean, REALLY good.
Then Mare took me to a roller rink after x-amount of years later and I realized I can't do that anymore. My mind remembered how - but my body said "oh hell no". Now it hurts when I fall, lol. The kind of ouchie that keeps me laid up for days.
I'm sure that if I picked it up and continued to practice it'll all come back, but at this point in my life - it's a been there, done that - and I'm okay with that. But I refuse to never say never.