With her vibrant features and still trim-as-a-teenager figure, it's hard to believe actress Marisa Tomei is 45 years old. How does she do it? "It's been a lot of trial and error," admits Marisa. "But wanting to live a full and, even more important, a pleasurable life has helped me find what works for me." After showing the entire SHAPE crew how to hula-hoop, she shared her strategies for being healthy and oh-so-happy. And she gave us her hula-hoop routine, which sculpts sexy abs while you're having fun.