How they claim its not performance enhancing is beyond me, how slower can some one who weighs 100kg run compared to that same person at 95? Not prob a lot but over 4 quarters and with less effort to drop the bulk they all put on it means they dropped the weight quickly and could train harder, as for during the year when they are only allowed to run X amount of ks mid week, an injection means they don't have to work as hard to maintain their weight.