L lizzie New member May 19, 2010 #1 Why would a person with a high fitness rating need to exercise for longer periods of time to achieve a target heart rate than a person with a lower fitness rating? So pretty much, people who are in shape, what builds their stamina?
Why would a person with a high fitness rating need to exercise for longer periods of time to achieve a target heart rate than a person with a lower fitness rating? So pretty much, people who are in shape, what builds their stamina?
