I had a stress fracture from teaching aerobics on concrete floors, about 25 years ago. No carbon inserts back then, but I stayed off of it, in terms of weight bearing exercise for 4 weeks (that was difficult) and I swam (even more difficult!). I didn't ride back then, but I can see how cycling would be OK. I never had a problem again, since the gym put in a wood floor and it solved the issue. I do remember that I had to be somewhat careful about the types of street shoes I wore for awhile, but, I think the fact that i wore 3 inch heels back then probably didn't help.



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