Physical education has long been concerned with exercise for the development of circulatory-respiratory endurance. Such exercise requires moderate contraction of large-muscle groups for relatively long periods of time, involving major adjustments of the circulatory and respiratory systems to the activity, as in distance running and swimming.
Physical education has long been concerned with exercise for the development of circulatory-respiratory endurance. Such exercise requires moderate contraction of large-muscle groups for relatively long periods of time, involving major adjustments of the circulatory and respiratory systems to the activity, as in distance running and swimming.
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