"People who cycle regularly in mid-adulthood typically enjoy a level of
fitness equivalent to someone 10 years younger and their life expectancy
is two years above the average.
On average, regular cycle commuters take more than one day per year less
off sick than colleagues who do not cycle to work, saving UK businesses
around £83m annually. Also, people who do not cycle-commute regularly
have a 39% higher mortality rate than those who do."

http://www.ctc.org.uk/campaigning/vi...th-and-cycling
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Bod