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.
If 3,000 of the steps you take each day are at a pace of 100 per minute for at least 10 minutes, you will meet this goal. Even a small increase in steps per day above being inactive can make a difference in health. Numbers as low as 6,000 steps per day were shown to correlate with a lower death rate in men. Experts view 10,000 steps per day as too few for children. But 10,000 steps can be too challenging for people who are elderly, sedentary, or who have chronic diseases.