70-year-old woman completes ultra-marathon in Sierra

Gunhild Swanson, a 70-year-old grandmother, completed an ultra-marathon in the Sierra foothills, July 3, 2015. (KGO-TV )

A 70-year-old grandmother finished an ultra-marathon in the Sierra Foothills with just seconds to spare.

Gunhild Swanson finished the 100.2 mile race from Squaw Valley to Auburn with just six seconds left before the 30-hour cutoff time.

The overall winner, who finished 15 hours earlier, came back to run the last mile with Swanson.
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