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==Key Stage 3==
===Meaning===
'''Exercise''' is any movement that needs a lot of effort and increase increases our heart rate and breathing rate.
===About Exercise===
: [[Exercise]] strengthens the [[diaphragm]] and [[Intercostal Muscle|intercostal muscles]] allowing you to [[inhale]] and [[exhale]] more.
: Athletes have slower [[heart]] rates than [[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==
===Meaning===
'''Exercise''' is any repetative physical activity that causes our heart rate and breathing rate to increase and can cause [[muscle]]s to grow.
===About Exercise===
: '''Exercise''' causes the rate of [[respiration]] to increase as the [[muscle]]s need more [[energy]] to work.
: '''Exercise''' causes the breathing rate to increase in order to supply more [[Oxygen]] to the [[muscle]]s and get rid of the extra [[Carbon Dioxide]] in the [[blood]].
: '''Exercise''' causes the [[heart]] rate to increase to pump the [[blood]], containing [[glucose]] and [[Oxygen]] around the body quicker to get to the [[muscle]]s that need it.
: Repeated '''exercise''' causes the [[muscle]]s of the [[heart]] to become stronger which allows the [[heart]] rate to be lower. A person with a low resting [[heart]] rate is able to pump [[blood]] more efficiently and can be described as more 'fit' than a person with a high resting [[heart]] rate.