But a reduction in frequency , intensity or duration will result in de-conditioning .
The higher the level of fitness , the longer duration the cardio can take , but there is no evidence to say that cardio fitness will become better with a longer duration .
A reduction in frequency , intensity or duration will result in de-conditioning .
The higher the level of fitness , the longer duration the cardio can take , but there is no evidence to say that cardio fitness will become better with a longer duration .