WebMD Fitness Rx Challenge

We're past the halfway point in our WebMD Fitness Challenge, and the finish line that once seemed far away for Jeff Kibler and Stefanee Williams is looming closer. They navigated the holiday season -- family gatherings, office parties, and cookies -- with an attitude of "maintain, don't gain." It's time to pump up their workouts and redouble their commitment to their goals. Let's see how they're doing.

In a Weight Loss Rut

Jeff Kibler
Age: 53
Weight: 195 lbs.
Goal: 170 lbs.

Jeff has hit a plateau with his weight, struggling fruitlessly to get down below the high 190s. "The weight just hasn't been coming down," he says. "I know I'm shrinking, and my clothes are looser, but I'm kind of stuck at this weight."

Nutritionist Kathleen Zelman thinks part of the problem may be mindless eating. "What Jeff's facing is what most people face when they start a diet and fitness plan. They go gangbusters at first, and then reality sets in, portions start creeping up, and suddenly they're stalled," she says. "There's some value to having a little liberty once a week, but the liberty has to be controlled. Have a piece of cheesecake -- don't eat the whole pie."

Jeff also started to rely a little too heavily on PowerBars to get him through long workdays. His two-bar-a-day habit added more than 600 calories to his daily total, so he's replacing one of them with lighter, but still filling, snacks such as apples and baby carrots. It's particularly tough this time of year, he admits: "As the days start getting shorter and it gets dark earlier, I want to eat more."

Meanwhile, Jeff is eager to get back to regular workouts after a bout with a stubborn chest cold. "I'm antsy about not being in the gym, but it's hard to breathe," he says. "It's frustrating to want to work out but know you're not up to it."But Jeff now knows that when he sets a fitness goal, he can achieve it: He's officially a triathlete. Last fall, he completed the Dewey Beach Sprint Triathlon, coming in 117th out of 129 in the first-timers category. "I wasn't last!" he says. "The important thing is, I finished." His total time was just under an hour and 40 minutes -- which he plans to beat when he competes again next year. "I'll be lighter then," Jeff promises.

And despite the plateau, Jeff's progress has been obvious to family and friends. "People are really noticing the difference. Even my face has thinned out. I'm wearing clothes that I haven't worn in years," he says. "But I really want to start dropping more weight now. Once I can get back out and start working out again, I think that will happen."

Find out Jeff's current vital stats -- weight loss, inches lost, cholesterol levels, and more.