Zandra Hooks, far right, and Kirk Hurley can answer phones and do computer work (and burn 100 to 130 calories an hour) on their Walkstations at the office.

By MANDY KATZ

Terri Krivosha, a partner at a Minneapolis law firm, logs four kilometers each workday on a treadmill without leaving her desk. She finds it easier to exercise while she types than to attend aerobics classes in the early morning.
Brad Rhoads, a computer programmer and missionary in Princeton, Illinois, faces a computer monitor on a file cabinet and gets in about eight kilometers a day on a treadmill while working in his home office.
¡°After a while, your legs do get kind of tired,¡± said Mr. Rhoads, 40, who started exercising in March, when doctors advised him to lose weight after open-heart surgery.
Ms. Krivosha and Mr. Rhoads are part of a small but growing group of desk workers who were inspired by Dr. James Levine, an endocrinologist at the Mayo Clinic in Minnesota. In 2005, Dr. Levine led a study showing that lean people burn about 350 more calories a day than those who are overweight, by doing ordinary things like fidgeting, pacing or walking to the copier.
To incorporate extra movement into the routines of sedentary workers (himself included), Dr. Levine constructed the first known treadmill desk by sliding a bedside hospital tray over a $400 treadmill. With a laptop and a phone headset, he said he can go all day at a leisurely 2.2 kilometers an hour.
The so-called work-walker can burn an estimated 100 to 130 calories an hour at speeds slower than three kilometers an hour, Mayo research shows.
Enthusiasts began following Dr. Levine¡¯s example, constructing treadmill desks that range from sleekly robotic setups to rickety combinations. But the recent introduction of an all-in-one treadmill desk from Details may slowly bring workwalking into the mainstream, as dozens of businesses invest in the hardware to let their employees walk (and, ideally, lose a little weight) at work.
Since last November, about 335 Walkstations have been sold across America to companies including the insurance company Mutual of Omaha, the pharmaceutical giant Glaxo-SmithKline and Best Buy, the retailer.
The Walkstation, which Dr. Levine helped develop, costs about $4,000 and comes in 36 laminate finishes with an ergonomically curved desktop. Its quiet motor is designed for slow speeds, said David Kagan, director of marketing communications at Details, a division of Steelcase.
Still, to most, work-walking is ¡°a freaky thing to do,¡± said Joe Stirt, 60, an anesthesiologist in Charlottesville, Virginia, who works and blogs while walking up to six hours a day in his home office.
Mr. Stirt¡¯s site, www.bookofjoe .com/2007/10/treadmill-works.
html, is one of some dozen work-walking blogs, including www.treadmill-desk.com and treadmill-workstation.com.
There is even a burgeoning social network (officewalkers.ning.com), with around 30 members, that Mr. Rhoads started in March.
To the uninitiated, work-walking sounds like a recipe for distraction. But devotees say the treadmill desks increase not only their activity but also their concentration.
¡°I thought it was ridiculous until I tried it,¡± said Ms.
Krivosha, 49, a partner in the law firm of Maslon Edelman Borman & Brand.
Ms. Krivosha said it is tempting to become distracted during conference calls, but when she is exercising, she listens more intently. ¡°Walking just takes care of the A.D.D. part,¡± she said, referring to attention-deficit disorder.
Will work-walking free you from the gym forever- Not if you¡¯re seeking serious weight loss or peak cardio-respiratory fitness.
¡°Walking on the treadmill could be enough to prevent weight gain, but it¡¯s not going to melt the pounds off,¡± said James O. Hill, an obesity researcher and the director of the University of Colorado¡¯s Center for Human Nutrition in Denver.
Still, something is better than nothing, say workwalkers like Mr. Rhoads.
¡°At least a little bit of exercise will just be part of my day and part of my working,¡± he said. ¡°The one thing I always do is work.¡±

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