Fitness training programs in the workplace can improve fitness, cut cholesterol levels, reduce job stress and even improve attendance, according to new analysis.

Researchers at the University of Missouri looked at dozens of workplaces where exercise programmes had been implemented, including around 38,000 people, and found significant positive effects for the interventions on 'physical activity behaviour' at work.

Workplace exercise programs also helped to diminish lipids (harmful fats in the blood), and encourage weight loss, the researchers report claimed.

The more effective programs had several characteristics in common, including a facility for exercising on site and staff being able to exercise during the workday rather than having to come in early or stay late.

And while evidence is scarce on the long-term costs of workplace physical activity interventions, lead researcher Dr Vicki S. Conn noted, the fact that they reduce absenteeism suggests they could indeed save money.

"We have really good evidence that the interventions do work," said Dr Conn.

A separate study conducted by University College London has found that those who work in 'passive jobs' are also more likely to have low levels of physical activity during leisure time.