Are both these sentences correct:
a) "I felt great physical wear after walking 20km."
b) "I felt great physical strain after walking 20km."
B is correct. "
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B is correct.
We might say "I have a lot of wear and tear over my many years of running." or "There has been a lot of wear to/on my joints after running for twenty years."
"I've worn out my joints after years of running."
You can also say
"I felt the wear on my joints after running those 20 miles."