I feel you need to train ybs , mine will be trained up to first race then i stop training , just not worth running the gauntlet everyday and feeding the bops , problem is this if you don't train ybs they get stress when basketed , birds that are regularly been basketed get used to the stress as becomes more normal those that have fed and watered there ybs over night on weekends in there baskets will fair better than those that haven't , banging young birds in to races untrained have to rely on the drag to get them home many don't even leave the liberation site , training just sets them up for racing , ybs should be fit and in good health and no great need to take fat off them , ybs are the future of your loft and should you choose not to put the work in then it will show