so we do naturally have phosphocreatine in fact when you start to think about the various Energy Systems if I asked you Nick to do something that was an allout effort for 10 seconds that would not require oxygen right you're not tapping into your V2 Max or your oxygen delivery system it's frankly not even an Anor robic activity meaning you're not actually turning glucose into pyruvate into lactate Etc if you're doing something that is such a short burst of activity you are really relying on the phosphocreatine system to generate the ATP for that activity so if you're doing a 40 yard dash you're relying on phosphocreatine