This system is relied upon when sprinting but also to ‘get going’ at the start of races. Training that relies on aerobic energy production can be everything from short or long easy runs ...

Aerobic activities (lower intensity, longer duration) produce these effects most Energy system Increased production of energy from the aerobic energy system; increased tolerance to lactic acid ...

respiration does not need oxygen (unlike aerobic respiration). It is the release of a relatively small amount of energy in cells by the breakdown of food substances in the absence of oxygen.