SURVIVAL OF THE FITTEST

Us shares how Hollywood's hottest stars keep their health and fitness in check

- ISLEY ZEGAS

KENDALL JENNER 

Don't be fooled: The runway beauty, 26, works hard for her washboard abs. "People will find it hard to believe, [but] that girl squats, dead-lifts, [does] pull-ups," Jenner's trainer Gunnar Peterson told Us of her fitness routine.

"Everyone in [Kendall's] family who I've worked with has the same work ethic. There's just a drive, and it's goal-oriented and it's, you know... go as hard as you can to the end."

JENNA DEWAN