Concern over Sarah Palin's thin appearance prompted the 2008 Vice Presidential nominee and TV personality to reveal a bit of news: She's working on a new fitness and wellbeing book with her family, Palin told People Magazine.

"Our family is writing a book on fitness and self-discipline focusing on where we get our energy and balance as we still eat our beloved homemade comfort foods!" Palin wrote to People, adding that her family's method "works."

This isn't Palin's first foray into the fitness space. She's graced the cover of Runner's World magazine, but she was more than just a model: She's a long time and dedicated runner who regularly outpaces other Beltway jocks. For example, she finished the 2008 Anchorage marathon in 3:59 -- two minutes under current VP nominee and P90X enthusiast Paul Ryan's 4:01 finishing time in 1990 when he was 20 years old, according to the Washington Post.

Palin has been quoted as saying that she grew up doing "family runs" with her parents. She was a high school track star and earned the nickname "Sarah Barracuda" for her agressive prowess on the basketball court.

It's unclear whether or not Palin and her family are in contract with a publisher.

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  • Sheryl Crow

    The singer has long been a fitness devotee, and used to consider herself primarily a runner. But since having son Wyatt, she looked for something less time consuming and now swears by P90X, according to this red carpet interview.

  • Ray Lewis

    The Baltimore Ravens linebacker added P90X to his off-season training several years ago, and credits it for helping him continue to play, even at an age (37) when many athletes begin to retire. "I just incorporated it in a lot of different places in my workouts, and it's given me the challenge that I needed," Lewis <a href="" target="_hplink">told in 2009</a>.

  • Erin Andrews

    Erin Andrews, ESPN sportscaster and former <em>Dancing with the Stars</em> competitor got into P90X while on the road with her ESPN crew, <a href="" target="_hplink">she told <em>US Weekly</em></a>, adding that the program caused her to shed so many pounds that she switched to full-calorie soda in an attempt to retain weight. (NB: Healthy Living does not endorse soda as a weight maintenance strategy!)

  • Heath Shuler

    The Democrat congressman from North Carolina and former Washington Redskins pro was the first to join Ryan in the Congressional gym for P90X workouts while their colleagues used the machines, <a href="" target="_hplink">according to a 2010 feature in the <em>Washington Post</em></a>. He has since said that the program has helped him slim down and prevent injuries from other sports and activities.

  • Ashton Kutcher

    Faced with the prospect of appearing shirtless on-screen, the <em>Two and a Half Men</em> actor decided to ramp up his fitness efforts, including P90X in his routine, <a href="" target="_hplink">according to FitSugar</a>.

  • Emmitt Smith

    Hall of Famer and former Dallas Cowboy star Emmitt Smith is another pro athlete who's also a devotee of the fitness program, albeit in retirement. "I just started to get into P90X," <a href="" target="_hplink">he told journalists during a press conference two years ago. </a>

  • Pink

    The singer Pink's on-the-road routine is not for the faint of heart -- and it was inspired by her brother and his wife, who are both in the Air Force, <a href="" target="_hplink">according to an article in Women's Health</a>: <blockquote>I went [to visit them and she's doing P90X]. I couldn't keep up with her -- and she'd just had her first baby four weeks ago. I was like, This is bullshit! I will perfect this thing! So usually, I wake up and do an hour of cardio, then an hour of P90X or yoga, then a half-hour of warm-up [during show rehearsal]. I do that six days a week.</blockquote>