Running a marathon is hard enough, but doing it with one-hundred pounds on your back, is a completely different challenge.
William Kocken says he plans to do just that at the Cellcom Green Bay Marathon.
He's not just going to run it, he's going to try to break the Guinness World Record for speed.
Kocken says he's running to raise money for 4th H.O.O.A.H Wisconsin, a group supporting area veterans and their families.
"Even though, yes, I’m going to break the Guinness World Record, that it's more than just that. It's not about me breaking the world record; it's about what we can do in our community, how we can help our veterans, and how we can help our fellow brothers and sisters in our community," said Kocken.
William Kocken was training running 16-miles on the Fox River Trail. The City of Green Bay also certified the scale Kocken will use on race day, May 20th, qualifying him for the record.
Good luck to William and the rest of the runners!