Clark has been obsessed with exercise since he was 19 years old. He exercises on a daily basis -- either running, using a stair master, an elliptical glider or lifting weights.
But a new medical study finds that exercise may not be enough if you spend your days in a sedentary job.
A Canadian study of 17,000 people that started in 1981 found that if you sit at work, you have a higher death rate from a wide variety of illnesses -- even if you exercise regularly! The results were published in
Medicine & Science in Sports & Exercise. To combat the dangers of sedentary jobs, Dr. James Levine of the Mayo Clinic has developed the
Walkstation. The Walkstation allows you to walk slowly at 1.5 miles per hour on a treadmill that's equipped like an office desk.
Clark himself has long stood while doing his job. When he owned a travel agency, he held standing meetings because he believed they were more efficient. He also does his radio show on his feet because he's a jitterbug.
