Kate Hudson's trainer, Brian Nguyen, shared the slimming and toning leg day workout the actress follows to keep her lower body sculpted.

From training with a Bosu ball to consuming a protein-packed diet, here are eight celebrities who swear by these flat-belly tips.

Celebrities like Kylie Jenner and Hilary Duff are fans of the 12-3-30 incline treadmill workout. Here's how it works.