keep your kids away from track and field until they are in HS. Unless you coach them yourself or have a really good coach that will not overtrain them. I find that europeans have a better understanding about how to train young children in athletics. If you look at some of the the track meets outdoors in europe they have shorter distances and more progressive training for kids. Here in the US the a-hole youth coaches train the kids like adults get them fast in the first year then they run no better as HS Seniors than when they were 12 or 13 years old. I wish my girls liked tennis they would kick ass with all the CF style training I have them do.