4. Britney Spears – “I do yoga, every day when I have a downtime, a lot of stretches and sit-ups. I feel better about myself physically and have more energy,” she said to In Style. (Photo: Splash News) 6. Mel B – “I don’t believe in diets, I believe in listening to your body and being consistent. If you want a burger, have one, but balance it out the next day by eating salmon and vegetables.” (Photo: Flynet)