Transport charity Sustrans says a proposed Active Travel Bill could save the Welsh NHS half a billion pounds.
According to a report released by the charity today, encouraging people to be more active could save the health service £517 million over 20 years.
If implemented, the Active Travel Bill would require local authorities to develop a network of routes for walking and cycling to encourage people to be more active. The charity says the Bill needs to have clear targets for an increase in levels of physically active travel.
According to Sustrans, increasingly inactive lifestyles are having an impact on rates of diseases like diabetes in Wales. Health expert and author of the report says the Active Travel Bill could help reduce the financial pressure of these diseases on the health service.
The Welsh Government is already driving several health and fitness campaigns, including Change4Life and 'Healthy School' schemes.