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.
Studies found that the average American adult only makes it about halfway to a goal of 10,000 steps per day, although those who wear an activity monitor or pedometer seem to log more steps per day. If you walk between 5,000 and 7,000 steps per day, you are an average American. However, this is a case where it definitely pays to be above average. At 5,000 steps per day, it is unlikely you are getting the amount of exercise recommended to reduce health risks.