For me Cycling used to be one of the things I did. In addition to Hiking, Climbing, Motorcycling, Spelunking, Bow Hunting, Boating, Fishing, Scouting... And lets not forget Partying, Dancing, Drinking... Obviously, I am more beat up than I look... Ha
WOW... It's been a blast...
Now days Cycling is about the only thing I do... Or rather can do... So I continue to...
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)