My son, age 7, caught the bug and is DYING to race. I've explained how difficult it is but can't quench his enthusiasm. So I'm going to put him in the Junior under 10 race this weekend. I figure it's just a chance for him to get on the course and experience it - he'll have on sneakers and be riding his hot rock. Anyone start their kids really young and have any tips or things I should know going in?