My son was a cross country runner in high school and he continued to run after HS graduation and before heading to Colorado. I asked him if he wanted to get together with others early in Colorado the week before I- Day but he stated calmly --"I'm gonna be with them for the next four years - I don't need to run early with them -- I'll wait"-- Once talking to my son after Acceptance Day he informed me - the Academy knows what they are doing-- the runs weren't that bad and it takes its toll on everyone in different ways --but its all expected-- they've been doing this a while and realistically a few runs a week before I-Day will not really get you accumulated to the altitude-- Its understandable to want to possibly get ahead in running and learning what it will fill like -- but don't worry - all the cadets will go through and get through it.--