Anyone who's tried to shed pounds knows this statistic: 95% of diets don't work.

That's what Jeff Hyman learned when his wife dragged him off to a weight-loss resort.

Hyman, then working at Sterling Partners, a private-equity firm, was 44 at the time—an age when men's metabolisms start to slow down. And his desk-bound habits were steadily packing on two pounds a year.

Hyman's experience at the resort changed his life. He left his job and started traveling. Along the way, he consulted dietitians, nutritionists, therapists and doctors, soaking up knowledge about how to live a healthier life.

Two years ago, Hyman decided to put his knowledge and the network of doctors he had accumulated to work for others. He launched Retrofit, formerly called Strong Suit Wellness, which now has $11 million in financing from Silicon Valley investors, to tackle America's obesity problem.

His solution is simple: It's a weight-loss program for individuals, not the groups of people that Jenny Craig and Weight Watchers traditionally serve. It targets professionals, who are too busy to commit consistent chunks of time to working out. And it supports people who have pledged to never step foot in a gym.

The program is robust:

• It is 12 months long. The goal is to lose 10 percent or 15 percent of your body weight.

• It costs $249 to $349 a month, or you can pay for the entire year upfront for a discounted rate. Three dozen companies, from Walgreens to Salesforce.com, offer employees Retrofit discounts too.

• Each Retrofit client is assigned three personal trainers: a therapist ("behavior coach"), a dietitian, and an exercise physiologist. There are more than 80 trained professionals and doctors who work with Retrofit clients one on one. The clients meet with each of the three coaches as often as once a week, at their convenience, over Skype. Hyman says the three coaches both "hug and kick" the clients. "They work with each customer in a very intimate way to change their behaviors and personalize a weight-loss program," says Hyman. "But they also hold people accountable, helping them make smarter everyday decisions."

• As part of the package, Retrofit clients get a Fitbit fitness tracker, which they wear at all times, and a Withings scale to record their weight. The Fitbit is a lightweight clip-on device that shows how many steps you take per day, and how many hours you sleep. The three trainers can then see their subject's daily progress and give them feedback in real-time. The scale keeps track of weight and lean muscle mass. Daily weigh-ins are sent automatically from the scale to a user's Retrofit log, which can also be monitored by the three coaches.