I think my next 30 day challenge will be this interval workout: http://www.runnersworld.com/peak-performance/new-workout-the-30-20-10-produces-impressive-results … Only 10 second sprints, but still promising results.
@JohnGStark done and done! A 30 day challenge it is!
(Note that you're only supposed to do it ~3x a week though.)
5:42 PM - 30 Jul 2015
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