Probably the most important fitness component is cardiorespiratory endurance(CRE). It is the ability to deliver essential nutrients, especially oxygen, to the working muscles of the body and to remove waste products during prolonged physical exertion.
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Probably the most important fitness component is cardiorespiratory endurance (CRE). It is the ability to deliver essential nutrients, especially oxygen, to the working muscles of the body and to remove waste products during prolonged physical exertion.