Celebs pay $4,100 to get fit at this grueling (and swanky) Malibu boot camp

There's a brutal boot camp that celebrities are flocking to in Malibu, and it's called the Ranch 4.0.

An offshoot of The Ranch at Live Oak / Malibu, 4.0 is a four-day program to help visitors begin to live a healthier lifestyle, all for $4,100. Guests are taken on rigorous, hours-long hikes and complete various workouts while there, but it's not all so tough.

Everyone stays in the gorgeous Four Seasons hotel in Malibu, and they get to enjoy the pools and spas during their free time. The program is popular with celebrities - Lea Michelle and Selma Blair have attended, to name a few.

This is what it's like to workout in luxury: