Positive vs. Negative splits. Do you HAVE to run negative to run a PR or BQ?This free infographic from Runners Connect has so many interesting stats. Marathon runners, this is sure to bring out the ultimate running nerd in you.

Positive vs. Negative splits. Do you HAVE to run negative to run a PR or BQ?This free infographic from Runners Connect has so many interesting stats. Marathon runners, this is sure to bring out the ultimate running nerd in you.

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