The 94 year old below me asked what that sound was. I told her it was my bike on an exercise machine. She said 'aren't you fit enough already'.
She also said it didn't bother her, she just wondered what it was.
Her hearing wasn't very good, so it might have been pretty loud. She moved out when she turned 99 and the new guy is officially deaf, so no problem.
I think I need deaf neighbors...