NEW YORK (CBSNewYork) — As a member of the Brooklyn Nets, Kris Humphries has no trouble staying in shape.

But he knows that childhood obesity is a problem in the United States. That’s why he’s hosting the Kris Humphries Challenge For Kids.

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On Tuesday, 50 local kids in Brooklyn will spend the day playing basketball, doing sprints and working on their fitness with the NBA power forward and reality television star.

“I’ve had a long partnership with the YMCA where I’m from in Minnesota, and coming out to Brooklyn, I was excited to get involved with the community and childhood obesity is something I really believe in fighting.”

While many know him as Kim Kardashian’s ex-husband, Humphries remained mum on the subject of his high-profile, short-lived marriage. He insisted that through the ups and downs of stardom, he is trying to stay focused – and put his fame to good use.

“It’s more trying to find way to use it for good,” Humphries said of his star power.

Teaching children healthy eating habits and fighting obesity is what he’s focused on for now.

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“I’ve always worked with kids, but probably within the last year or year and a half, I’ve really narrowed it down,” he said.

“It’s actually the first generation that’s not expected to live longer than the generation before,” said Humphries. “So it’s a serious issue, and I want to put my time towards it.”

Physical fitness is something he knows well.

“I really watch my diet a lot. It’s important for my performance, and for kids I think that educating them, getting them active, letting them know that in the days of Xbox, Playstation, you still gotta get outside and exercise.”

For the full interview with Kris Humphries, check out the video below. And let us know: Are you excited for the Nets to come to Brooklyn?

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