Very true, very true! They key is "sustainable" as you say. I must say I was paranoid about my bike seat position at first. I didn't want to aggravate things by having it too low but I had to have it low in order to be able to get on and off the bike. Fortunately it didn't seem to matter as far as my knees were concerned. But then I'm lucky that my arthritis seems to be everywhere BUT my knees.
Starting early is also the key so you should be biking at 100!




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