I'd heard of dance video games being used to lose weight before. Heck I think there've been one or two sitcom episodes written around the concept. But an insurance-company backed research project involving them, well, that's a new one:

Like many other 11-year-old boys, K.D. Jones loves sports. But at 5 feet, 175 pounds, he found his weight and his asthma an obstacle.
...
Jones is one of 85 children in an at-home study trying the popular Dance Dance Revolution video game to boost their activity. The study is being done by West Virginia's public employees insurance group in hopes it will lead to better health and lower costs.

The kid's already lost 20 pounds, and has even got his mom into the act. Lose weight, play games, maybe even learn to dance, all while lowering your insurance rate. What's not to love?