Megan Fox has been called the hottest woman on the planet. But despite what you may think, the actress is not a fitness fanatic. In fact, she's said that her personal trainer basically has to force her to work out. But Fox knows what to do to stay in top shape when it counts - like when she's preparing for a movie. To get ready for her role in transformers, Fox's workout focused on bodyweight intervals. One of the best things about bodyweight intervals is that they don't require any equipment. So Fox could fit in a workout anywhere. You just need enough space to do 4 to 8 exercises back-to-back with zero rest in between. After you do all of the moves, you rest for 1 to 2 minutes and then complete the entire circuit again. Your heart will really be pumping when you finish. But for the best results, do what Fox did and follow your bodyweight circuit with 30 minutes of steady state cardio on the stationary bike. This is the real secret behind Fox's amazing body. You've probably heard that high-intensity intervals are great for burning fat - and that's true. But Fox's plan goes one step farther. You see, intervals are great at releasing fat into the bloodstream, but not great at using fatty acids once they're released. Low intensity cardio like biking is great for using fat for energy, but not great at releasing fat from the fat cells in the first place. Fox's workout uses both. She does bodyweight intervals to release the fat, and then she does low-intensity cardio to use the fatty acids for energy. And that's how you earn a title like the best body in Hollywood. To learn more celebrity fitness secrets, check out other videos in this series.