[m0xte]

I suggest you look for more than just arthritis related information. The amount of mechanical wear it causes is significant over time.

That is not to say it doesn't have benefits but to suggest the entire population can haul their arse on a bike doing a 20mi round trip every day for 40 years and be hopping along nicely is a dream.

Not to mention the incidental injuries of which my colleagues suffer from, and myself going back a few years (hospital wasn't much fun)

[gindely]

No, come on, provide something concrete. Searching for "cycling joint wear" just provides unreliable sources saying you don't use your joints up, but it doesn't provide unreliable (or reliable) sources saying the opposite.

It is easy to avoid incidental injuries, and everyone would much rather the trauma of an incidental cycling accident than the trauma of a highspeed car crash. Mentioning them in just scaremongering. Ride at a safe speed on a proper path and look where your going. If you can't look where you're going, you're going too fast; slow down. (You can't say "proper paths don't exist", because we're talking about the dreamland in which they do, therefore, by definition, they do.)

20 mi round trips are unlikely. You get long trips in cities developed for cars.

[kaybe]

And get a properly fitted bike. Japan, I'm looking at you.

[HeadsUpHigh]

This is 20th century nonsense that has been debunked. Your body is not a battery that you use up, use means regeneration. Not using your joints for strength production is more harmful than biking everywhere.