by Cait Chock, Published Sep. 17, 2014, Updated Jan. 18, 2016 at 12:29 PM UTC
These short bursts during a training run teach your body how to run faster.
by Duncan Larkin, Published May. 10, 2011, Updated May. 10, 2011 at 10:13 AM UTC
Post-run sprints are also part of their regimen.
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