That would make people who ride older rail trains (like Chicago's trains) regularly super healthy. People who ride horses would be super healthy, too. Train conductors. Anyone who does a lot of off-roading. Etc. Oh actually, people who have shaky legs would have disproportionately healthier legs than the rest of their body.

But actually moving around a lot wouldn't make a difference if the bits in your cells are moving around at hundreds of miles per hour.