Zac Efron doesn't just get his rock hard body from the High School Musical choreography -- the actor earns those abs on a surfboard. As a matter of fact, his High School Musical co-star Ashley Tisdale gave him an Indo Board for his 21st birthday to help him improve his surfing skills.

As Zac probably is well aware, activities that keep you off-balance do a phenomenal job at working your core, thus helping to create enviable abs. Surfing is great for that, but lots of other sports provide a tough core workout, too, like water skiing, snowboarding, and skateboarding.

Zac isn't the only celebrity to embrace surfing as a sport -- check out the gallery below to see some other famous folks who know how to catch a wave.

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Shock jock Howard Stern has a gorgeous new wife and while they're still enjoying the honeymoon period (they've only been married a month), a good deal of their physical activity has taken place outside the bedroom -- they've been running.

Beth Ostrosky was training for the New York City Marathon that took place this past weekend and has run every day since her October 3 wedding. That's not a problem for Stern, who is already a runner. Ostrosky told People, "The greatest thing is that he's a runner and he's been running most of the mileage with me."

The training showed -- the former model, 36, finished much faster than her goal of five hours. She crossed the finish at four hours and 15 minutes, as her husband and stepdaughter cheered her on.

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When you put on a couple of pounds, it's easy to ignore it. But eventually, if you keep putting on weight, there will come a point at which you know things just have to change. Maybe it's a depressing shopping trip, or a photograph. Or, if you're Kevin Smith, it's when you break a toilet.

The director/writer/actor has been conscious of his size for some time now -- his doctor called him morbidly obese, which is sure to get anyone's mind on losing weight, but it was after breaking a toilet that he really realized that he needed to do something.

"I'm going away for a while to concentrate on myself," said Smith, "to save my life." Once he's done doing press for Zack and Miri Make a Porno, he plans to get away and focus on counting calories and losing a bunch of pounds. It sounds like he's in a bad place, but he's got a plan, and I hope he's got plenty of friends to help him through it -- we all know support makes a big difference!

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