<human>: I live in an old apartment building on the first floor and just got a treadmill to keep running through the winter. The floors and walls are such that when I am running on it the house sort of shakes a little every time my foot comes down. The best time for me to work out is early in the morning (around 6AM). I assume that my upstairs neighbor can hear and possibly feel me running. One thing you should know about my neighbor is that he is SUPER sensitive about some things, and not others. An example would be that he threw a fit over having a small Vespa scooter in the backyard, but has never complained when we have backyard parties with an open fire into the wee hours of the morning.
Should I preempt a problem by emailing him and asking if it is a problem, or should I wait it out to see if I drive him crazy enough to complain? I am worried that if I ask he will just say its a problem even if he can't hear it.

Can you give me the gist of the text in a nutshell?
<bot>: Have a new possibly very loud treadmill that I would like to run on early in the morning, not sure how to approach my sometimes super sensitive neighbor about it.