But if you use a wheelchair, it can be hard to participate..until now.
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A father in Suffolk County is putting together the first "all abilities" obstacle course.
14-year-old Zak Stengel loves to be active. But there was a time when he couldn't because he was in a wheelchair suffering from hemophilia.
"I understand what it's like to have a setback like that," said Zak.
"It was a very scary diagnosis, a diagnosis that left us very isolated because it's such a rare condition," said his father Adam Stengel.
After holding several hemophilia walks in the city, his parents came up with the idea of HappyFest, a Tough Mudder inspired one-mile long obstacle course for people of all ages and all abilities.
It's being held this Saturday at Long Island Sports Park in Calverton.
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Participants have choices. They can do the challenging obstacle or the alternate right beside it.
So instead of doing the balance beam for example, there is a wheelchair-accesssible alternative.
And instead of climbing a rope, just pull the heavy sandbag to the top.
The idea is that no one is excluded.
"With your family, with your friends, nobody's segregated, we do it together," said Adam.
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For more information on HappyFest including ticket prices, hours and to pre-register, visit http://www.happyfestusa.com
The organizers will be giving out 100 free tickets to military families. If interested, email happyfestusa@gmail.com.
Hear more from Adam Stengel and learn more about the obstacle course: