Nov 24, - 10 Best Fitness Bootcamps. W Retreat & Spa – Vieques Island. Chiva-Som--Hua Hin, Thailand. Mountain Beach Fitness Retreats--Verbier, Switzerland. The BodyHoliday - St. Lucia. The Ranch - Malibu, California. The Ashram - Spain and California. Miraval - Tuscon, Arizona. Bikini Bootcamp - Tulum, Mexico. Mar 25, - Fitness boot camps offer an opportunity to build your strength and healthy adults include aerobic exercise and strength training in their fitness.