From mountain climbers to leg raises, a personal trainer outlines the best deep core workout to sculpt a lean midsection like ...

"From a side plank, lift your top leg and arm into a starfish position. Hold or pulse," Willis suggests. "In a forearm plank, slide a mini band across the floor underneath you, from hand to hand. Keep ...

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