Woman in starting postition demostrated by a young female athlete while working out on an outdoor track in the summer. - Stock Photo & Image

Athletic woman on track starting to run. Healthy fitness concept with active lifestyle.

Sporty focused woman on start of treadmill prepares to run

Athletic woman on track starting to run. Healthy fitness concept with active lifestyle.

Young athletic girl preparing for run the race at the start

Athletic woman on track starting to run. Healthy fitness concept with active lifestyle.

Beautiful athlete on a race track is ready to run

Athletic woman on track starting to run. Healthy fitness concept with active lifestyle.

Young woman runner getting ready for a run on track. Sporty girl

Athletic woman on track starting to run. Healthy fitness concept with active lifestyle.

Young athletic woman stretching on stadium running track before jogging

Young woman runner getting ready for a run on track. Sporty girl

Young woman runner getting ready for a run on track. Sporty girl

EUGENE, OR - MAY 7, 2017: Runner heads down the river path at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

EUGENE, OR - MAY 1, 2016: Runner approaching the finish line on the track at Hayward Field during the 2016 Eugene Marathon, a Boston qualifying event.

EUGENE, OR - MAY 7, 2017: Official split point for half marathon and full marathon at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

EUGENE, OR - MAY 7, 2017: Runner heads down the river path at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

EUGENE, OR - MAY 1, 2016: Runner approaching the finish line on the track at Hayward Field during the 2016 Eugene Marathon, a Boston qualifying event.

EUGENE, OR - MAY 7, 2017: Runner Benjamin Mears comes through the tunnel at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

Official split point for half marathon and full marathon at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

EUGENE, OR - MAY 7, 2017: Runners cross a bridge over the Willamette River at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

EUGENE, OR - MAY 7, 2017: Runners cross a bridge over the Willamette River at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

EUGENE, OR - MAY 7, 2017: Runners cross a bridge over the Willamette River at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.

Official split point for half marathon and full marathon at mile 10 of the 2017 Eugene Marathon race held on the University of Oregon campus.