Vibrations are a constant worry for the ISS. The structure is pretty stiff - each module is connected with a series of bolts (20 I think) and very stiff steel r

Vibrations are a constant worry for the ISS. The structure is pretty stiff - each module is connected with a series of bolts (20 I think) and very stiff steel rings. One of the long term fatigue problems they have to worry about is the impact of space ship docking - the existing APAS-95 docking ports require a significant force to initiate mating which causes the whole structure to flex, especially the truss as it's perpendicular to most docking ports. NASA are planning to solve this with the low impact docking system (LIDS), but that's not going to be deployed until the Orion capsule flies, or perhaps the SpaceX crewed Dragon. Day-to-day all the exercise stations are mounted on special vibration reducing mounts, even the treadmill. Back in the Space Shuttle days there would be blackout periods for exercise to reduce the vibrations transmitted through the docking port to the shuttle. Space is a harsh mistress.