Hard to explain with one point. It is the great feeling of excersize. My lung capacity and stamina are much improved. It is the freedom of being outdoors, (I would hate just being in a gym). It's the wonder of a classic Peugeot where everything is working in sync and always has for 21 years. The flash of streetlight on the turning cranks and bright spokes. It's the small society of people I pass routinely, (mostly joggers) but some cyclists, each gives their own sign of recognition. Finally it's the camraderie of the forums particularly this 50+ group. Sort of lets me know I am not the only crazy person out there. KEEP RIDING!!