How much (or not) should a 14U pitcher be running/jogging to improve their stamina on the rubber and how does this amount change (or not) as they progress through 16U, 18U, and college? We are thinking about instituting some conditioning work for my DD and I am trying to get a handle on how much we should do (or not) and how to work it into our schedule. Is running, say, 1 mile a few times a week enough? More or less? Thanks.