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.
10,000 steps a day is recommended for most days, however there are other exercises that can bring this number down. If you are riding a bike for 30 minutes your steps can be reduced by up to 5000 steps. Cardio classes such as Zumba or kickboxing can also make you exempt from about 5000 steps. Swimming laps is a high calorie burn exercise that you can do for one hour and eliminate up to 7000 of those 10,000 steps.