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Interval Training for Cardiovascular Fitness. Part I: What is it? Why do it? cardiovascular fitness endurance interval training

I have decided to time my mile as part of my fitness testing.  In the past I have done a six minute test.  The six minute test is simply seeing how far you can run in six minutes.  Either process is not pleasant.  So why do it?

The speed at which you can maintain a pace for... more!