I can still get it and its from riding!
No longer able to walk, hike, climb, run, cycling is my only port of sanity.
Do a spin, get my heart rate up in my throat, air in and out of my mouth and nose at the same time, step off my bike with legs shacking...
Endorphins my arse!
It's a cool, clean, RUSH!
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)