The Energy System That Produces ATP The Fastest
The Phosphagen System generates ATP at the fastest rate.
Despite the activity you are doing all activity begins by using ATP from the phosphagen system. The phosphagen system is the primary energy system for short duration, high intensity activities. Short sprints, plyometrics, and explosive lifts all rely on the phosphagen system to provide ATP fast.
Although the phosphagen system provides ATP quicker than other energy systems, it provide the smallest amount of ATP.