trust me.

All of the body's energy systems work by creating new ATP molecules that when broken down turn inti ADP and release energy.

The Aerobic, Anaerobic and ATP CP all do this in different ways, rate and amounts before the system cann't create any more until it is replenished.

The ATP CP system works when CP (creatine Phosphate) looses a phosphate molecule which binds with ADP (which only has two molecules, ATP has three (tri) and looses one, becoming AD(dual)P) making the ADP back into ATP.

The ATP CP system uses Creatine Phosphate as its source, it resynthasises ADP into ATP extremely quickly but in very limited quantitys, especially compared to the Aerobic energy system which creates ATP at a much slower rate than the ATP CP system, but the system can produce vastly more ATP before shutting down.

The rate at which energy is created in the system determs the force of contractions it is available for (a sudden explove contraction can only be made by a system that can supply the energy needed for that contraction in an instant) and the amount of ATP that the system can create before needing to be replenished by the metabolism determins the duration.

The ATP CP and Anaerobic energy systems do not require Oxygen, thats why you can exhale has you contract during a clap press up or for the duration of a 6 punch combination (which are a mixture of ATP CP and Anearobic) but you can't exhale for the duration of a jog.
















(or hold your breath whilst sitting still, breathing, your heart beating, your brain working... all needs Oxygen to work