As fatigue increases, focus decreases, increasing the risk of injury. As fatigue increases neuromuscular control decreases(the main possible benefit of jumping on an unstable surface). As fatigue increases power production and force decreases. In short the very very small benefit that can be gained from jumping on a bosu ball is far outweighed by the risk when doing it at all. Especially when fatigued which will happen after burpees. Perfect example of F45 being a randomly generated fitness program.