Cyclists ride up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
A runner heads up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
A cyclist rides up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
A runner heads up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill as a police officer looks on during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Spectators hold up signs at Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
A spectator holds up a sign at the top of Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
A runner carries an American flag up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners hit the top of Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners hit the top of Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
A runner stops to take a selfie at the top of Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill_4600
Runners head up Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
Boston Marathon 2017 - Heartbreak Hill
Runners reach the bottom of Heartbreak Hill during the 2017 Boston Marathon. (Photo by Matt Dolloff/CBS Boston)
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