Best lubricant I have found for the knees is the bike. I used to run and ruined the knees from pounding the streets in training. Even better was once I learnt to spin faster. Took the strain off the knees on the stiff climbs and I have never taken any additives that were not on prescription for any of my aches and pains.
If I do not ride for a couple of weeks- I do start to have joint problems. All I have to do is get back on the bike and I am fine again.
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How long was I in the army? Five foot seven.
Spike Milligan