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.
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Replying to @mattcutts
@mattcutts saw the same article and tried it with the dog this morning1 reply 0 retweets 0 likes
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