Most of my rides are pretty good, and I think the big thing is having built my fitness up enough that it's not the limiting factor. I can now do a 60 mile ride without the last 10 miles being a death march. But, yeah - the days when you feel like a Cycling God, when the bike and you are so in tune that you feel like a single unit, and you feel unstoppable? I have no formula for increasing the frequency of those.
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"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles