by Joe Friel, Published Mar. 6, 2015, Updated Jan. 18, 2016 at 12:29 PM UTC
In order to reduce the decline in aerobic capacity with advancing age, training must be intense.
by Matt Fitzgerald, Published Nov. 29, 2010, Updated Nov. 29, 2010 at 12:43 PM UTC
Matt Fitzgerald explains the difference between a fast pace and hard effort during a progression run or other types of high intensity
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