After 12 weeks with a workplace exercise program, 51 percent of workers were exercising three to five times per week.
Employees who did not have the program showed no change in their exercise habits.
Researchers say setting realistic exercise goals, and gradually increasing weekly exercise times by 10-minute chunks, can help people become and remain active. They also say having the support of a group plays a large role.
The study is in the American Journal of Preventive Medicine.