Hottest Bodies 2014

Sneak Peek: PEOPLE's Most Amazing Bodies of 2011

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Though Stefani, 41, has said, "Yoga or Pilates – they don't work for me," clearly the rocker mom (to Kingston, 5, and Zuma, 2) is doing something right. Her strategy for looking half her age? Cardio intervals and weight training four times a week with trainer Mike Heatlie, and several small meals a day of "lean meats, sweet potatoes for carbs and lots of green vegetables."