Originally Posted by Midnight Biker

Absurd? Thinking that taking a century ride ALL at a vigorous 16 mph pace would not scar your myocardium would be way more absurd than what I said. People and all animals for that matter are not built to go super hard for super long distances. Granted, maybe I exaggerated a little. You could probably pull it off safely at a consistent moderate, occasionally vigorous pace, with plenty of breaks in between, but for God's sake don't hammer it. I guess, for me personally, to feel totally save, I would have to do most of it at around 11 mph, slowing down here or there, and speeding up only occasionally when road conditions oblige.