Ageless Center Lexington, London

No amount of time spent researching can replicate experience. So, when it comes to its weight-loss supervisors, Ageless Center gives its clients both—the staff members have lost more than 1,200 pounds collectively. So when they teach, they're drawing from memory as well as their studies. They utilize six programs to help people drop unwanted pounds, recalling their own struggles as they monitor each client's progress at weekly meetings. They've even written their own cookbook with healthy recipes and tips.

In the interest of boosting confidence even further, the center has its own medical spa onsite. There, visitors can treat their complexions to facials, fade wrinkles with injectables such as Botox, and clear away bothersome body hair or skin imperfections with laser procedures.