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On May 15, 2011, the Maryland Half Marathon had an unusual and unexpected competitor - a four-legged canine named Dozer. E:60 takes you to the course and reveals how Dozer reached the finish line and bested thousands of runners.

Summer Sanders finished the 2013 Disney Princess Half Marathon with a smile on her face.

Summer Sanders shares tips on proper nutrition as she trains for the Disney Princess Half Marathon.

Summer Sanders discusses the importance of setting goals as she prepares for the Disney Princess Half Marathon.

Sage Steele had a busy weekend of meeting fans, presenting on stage, spending time with her family -- and running the Disney Princess Half Marathon.

Sage Steele completes her first half marathon in impressive fashion.

Sage Steele recounts her family activities the day before her race.

Experienced half-marathon runners have words of advice for Sage Steele.

Sage Steele checks in from Disney World 48 hours before her first half marathon.

Sage Steele gets some tips on how to fuel up during the Princess Half Marathon from Jen Van Allen of Runner's World.

Sage Steele gets tested at the Gatorade Sports Science Institute and gets some tips from Texans DE J.J. Watt.

Sage Steele gets a sneak peek at the Disney Princess Half Marathon race course with trainer Jeff Galloway.

Sage continues to train for the Disney Princess Half Marathon and has a few questions for her trainer Jeff Galloway.

runDisney training consultant Jeff Galloway takes ESPN's Sage Steele to the track to run a "magic mile" to help determine her ideal half-marathon pace.

As she embarks on her first week of training, Sage Steele gets support -- and words of wisdom -- from her husband and three children.

Knock, knock: "SportsCenter" anchor Sage Steele meets her half-marathon trainer, Jeff Galloway, for the first time.