What I've noticed, with myself and others, is that it isn't an issue of riding far or riding fast. The big issue is just getting out every day and doing something. You get a nice spring day here, and everyone's out "getting in shape". But when it's 40 or 100, you'll have the trails to yourself. That works out to about 60 "getting in shape" days here, and about 305 "too hot or too cold or too wet" days in a year.
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"be careful this rando stuff is addictive and dan's the 'pusher'."