by Matt Fitzgerald, Published Jul. 10, 2013, Updated Jan. 18, 2016 at 12:25 PM UTC
The current mania for high-intensity interval training has some runners wondering if they’re wasting their time “jogging.”
by Duncan Larkin, Published Mar. 15, 2011, Updated Mar. 16, 2011 at 5:44 AM UTC
The treadmill can actually be your friend.
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