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The ATP-CP system or formula one car is the predominant energy system used when competing in short duration, high intensity 'power' events such as the 100m sprint, shot pot and high jump. It is the most powerful energy system, it is immediate and does not need oxygen to function. The downside to this is it can only be used as the predominant energy system for 6-10 seconds. During the first few seconds of any activity, ATP supplies stored in the body provide the energy. Between 2-5 more seconds after that, CP kicks in and supports the decline of ATP until there is a change to a different predominant energy system, The ATP-CP system has the fastest rate of ATP resynthesis. It resynthesis ATP through the breakdown of the body fuel creatine phosphate. There are no by-products from the ATP-CP system.