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===About Exercise===
: [[Exercise]] increase the rate of [[respiration]] in the [[muscle]]s. This provides the [[muscle]]s with the energy they need to move.
: Athletes have bigger [[lung]]s than [[Mean Average|average]] because regular aerobic [[exercise]] can increase the [[Volume (Space)|volume]] of the [[lung]]s. This allows them to take in more [[oxygen]] for [[respiration]].
: [[Exercise]] strengthens the [[diaphragm]] and [[Intercostal Muscle|intercostal muscles]] allowing you to [[inhale]] and [[exhale]] more.
: Athletes have slower [[heart]] rates than [[Mean Average|average]] because regular aerobic [[exercise]] makes the [[heart]] [[muscle]]s stronger so the [[heart]] doesn't need to beat as often. This allows the [[blood]] to be sent around the body more quickly providing the [[muscle]]s with [[oxygen]] for [[respiration]].
==Key Stage 4==