The Ranch at Live Oak

Malibu, CA

Daily 10-mile hikes and four hours of fitness classes: These are the non-negotiable terms at this five-star boot camp, where you’ll receive tiny yet beautifully presented meals totaling 1,500 calories a day. (Typical mid-hike snack? Four almonds, two cashews.) Making up for the challenges are swish guest rooms, daily massages and 
a smaller dress 
size upon departure. $5,600 per week, theranchmalibu.com