Inspiring Mike. Incredible amount of fortitude. I'm going to make one suggestion, and that is to give yourself a day off the bike every couple of days until your butt gets used to the seat. If your sore and don't give it a rest, you'll just get more sore, but if you take a day to rest, you can heal. It'll seem to slow your progress at first, but if it allows you to ride more after the recovery day, it's doing you good.
A general rule is to add 10% every week, so don't push yourself too hard.
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Tom
"It hurts so good..."