I wish I had done a 100!!!!!!!! I have found mt biking to be more fatiguing than my roadie days......... (or maybe cuz I am 50 ???) Anyway..do you read Selene Yeager's blog (Fitchick) she has done leadville- lots of good training tips!!! cheering for you! post when you want encouragement- 3 more kids through college till I am there with you- so thrilled to enjoy vicariously (: