Want to live longer? Reduce your risk of cancer? And heart disease? Then cycle to work, say scientists. It's as simple as riding a bike when the option is available. Cycling to work can cut cancer and heart disease.
The biggest study into the issue linked using two wheels with a halving of the risk of cancer and heart disease.
The five-year study of 250,000 UK commuters also showed walking had some benefits over sitting on public transport or taking the car.
The team in Glasgow said cycling took no willpower once it became part of the work routine - unlike going to the gym.
The five-year study compared people who had an "active" commute with those who were mostly stationary.
Overall, 2,430 of those studied died, 3,748 were diagnosed with cancer and 1,110 had heart problems.
But, during the course of the study, regular cycling cut the risk of death from any cause by 41%, the incidence of cancer by 45% and heart disease by 46%.
"This is really clear evidence that people who commute in an active way, particularly by cycling, were at lower risk," Dr Jason Gill, from the University of Glasgow, told the BBC News website.