Article: Highs and lows of the Twin Cities Marathon; After running all 17 Twin Cities Marathons, Dr. Rob Johnson knows the course by heart. Here's what Johnson and other runners see on their 26-mile trip.(SPORTS)

If you want to know what it's like to climb mountains, you look for a guide with credentials, someone who can tell stories of the big peaks.

Dr. Rob Johnson can tell stories about running's big peak: the marathon. He's run nearly 50 of them. And Sunday he looks to add to his streak of 18 consecutive Twin Cities Marathons. In other words, every Twin Cities Marathon.

Johnson, Director of Primary Care Sports Medicine at the Family Medical Center in Minneapolis, was shown a map of the Twin Cities course and asked to describe the runners' highs and the glycogen-depleted lows. Here is his virtual tour.

The Twin Cities Marathon - widely considered among the top three in ...

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