How does one know what it feels like to feel 10 years younger than one is?

If I feel like I felt 10 years ago, was I feeling 10 years older back then?

I can understand what it feels like to feel older than one is. I live with that frequently.

freezerdoor,

I bet you just need to reacclimate your body to exercise. Plus, your dopamine reaction may not be working the same. Dopamine is a natural pain reliever.

No runners' high anymore, maybe.