BROOKLYN - It's time to ring in a new year, and for many people that means out with poor eating habits and in with a new, healthier routine.

CrossFit is a fitness phenomenon that's been gaining popularity lately. It's been around for more than 14 years.

It involves high intensity functional movements that are constantly varied. It's a combination of weight lifting, calisthenics, running, jumping, rowing and other activities.

Steve Lynch, of Class One CrossFit in Park Slope, says the benefits last long after participants leave the gym. "You can certainly improve your quality of life," he says. "You're going to continue burning calories 24-36 hours after your workout is done."

There are several CrossFit gyms throughout the city.