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Usually for amateurs I have riders peak for the most important 2-3 races per season. You cannot peak for every single event. Then the other non peak races become events that are essentially training events used to bring a rider up to that peak. Depending on how long you have been consistently training, a young athlete can hold a peak for 4-5 weeks at the most. This works for Ponca/LL for instance. After a peak event, fitness is purposely reduced and the timing of the next build periods is designed to bring about the next peak (which if done right will be higher than the last one).
As far as intervals, you have to be really careful in younger riders. For the younger riders I keep the highest intensity stuff limited to the actual motorcycle and leave intervals on the bicycles in the aerobic zones (up to zone 3). For older, more experienced riders that have done consistent training for years on end, I do use zone 4/5 intervals once during the race week to keep those fuel systems primed but again, the bulk of aerobic training is just that, aerobic.
Please post a response if you need more information, I am on a short break at Ponca and only have a few minutes at a time!
Good luck!
_________________ Coach Seiji www.coachseiji.com 
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