For instance, the motion of a spacecraft, regarding its orbit and attitude , is described by the relativistic theory of classical mechanics, while the analogous movements of an atomic nucleus are described by quantum mechanics.
According to the NHS, the average Briton walks between 3,000 and 4,000 steps a day - significantly less than the Fitbit target. Yet many people do significantly more, and for them 10,000 steps might not be much of a target.
RE: Is 10000 steps per day too much for the average person? 10,000 steps per day, assuming thirteen hours out of bed a day (maybe a lowball estimate), requires an average of almost 13 steps per minute for the entire thirteen hours. But if walking pace is probably two steps per second, then 10,000 steps would be about an hour and a half of walking.