A runner's calf muscles during a marathon in Stowe, Vermont.

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Dean Karnazes's calf muscles while running marathon number thirty-three on day thirty-three of the Endurance 50 event in Stowe, Vermont. The goal of the event is to run 50 marathons, in each of the 50 United States, in 50 consecutive days.

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Size: 5200px × 3467px
Location: Stowe,Vermont,United States
Photo credit: © Corey Rich / Aurora Photos / Alamy / Afripics
License: Royalty Free
Model Released: Yes

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