FRANKLIN (CBS) – Fourteen year old Will Doggett trains in his Franklin backyard. Whether it’s running laps or hoisting himself up a tree on a rope, Will vows to be ready for his 4th Fenway Park Spartan Sprint on Saturday.

“It’s basically an obstacle course. There are walls you have to climb over. There’s a spear throw, and there’s plenty of burpees you have to do,” he explains.

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Will Doggett trains for Spartan Sprint. (WBZ-TV)

Will is one of about 12,000 people who will compete, but the course isn’t the only thing he’ll have to overcome.

When Will was just one month old he contracted a respiratory virus.

“He got med-flighted to Children’s Hospital in Boston, and spent 3 months there in intensive care,” says Will’s mother, Ariel Doggett.

The virus permanently damaged his lungs.

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“He was on numerous ventilators. His lungs actually shredded,” she says.

At the same time he suffered a stroke that damaged his eyesight.

“I didn’t want to leave the room because I didn’t know if he was going to be there when I came back,” Ariel says.

Will Doggett (WBZ-TV)

But when he was about 10, Will decided he wanted to run a grueling Spartan race with his mother, and he’s never looked back.

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“I’m always kind of worried to make sure my breathing is fine, but overall I’m always having a blast. I hope someone will see me as a person who has overcome tons of obstacles, and maybe they can overcome a lot of obstacles of their down,” Will explains.

Lisa Hughes