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: Not enough '''exercise''' can make us unhealthy. It causes us to become weak and it increases the risk of heart attack.
: '''Exercise''' helps prevent us from getting overweight but research suggests that it doesn't make us lose weight. Only a better diet can cause you to lose weight.
==Key Stage 2==
===Meaning===
'''Exercise''' is any movement that needs a lot of effort and increase our heart rate and breathing rate.
===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 [[average]] because regular aerobic [[exercise]] can increase the [[volume]] of the [[lung]]s. This allows them to take in more [[oxygen]] for [[respiration]].
: 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]].