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.
The average number of daily steps you take indicates your fitness level. If you take under 5,000 steps a day, you lead a sedentary lifestyle and may lack endurance. If you take between 5,000 and 7,499 steps per day, your lifestyle is on the lower active side.