6. (Science: geometry) The formation or production of any geometrical magnitude, as a line, a surface, a solid, by the motion, in accordance with a mathematical law, of a point or a magnitude; as, the generation of a line or curve by the motion of a point, of a surface by a line, a sphere by a semicircle, etc.
Your weight is a balancing act, but the equation is simple: If you eat more calories than you burn, you gain weight. Because 3,500 calories equals about 1 pound (0.45 kilogram) of fat, you need to burn 3,500 calories more than you take in to lose 1 pound. So, in general, if you cut 500 calories from your typical diet each day, you'd lose about 1 pound a week (500 calories x 7 days = 3,500 calories). It isn't quite this simple, however, and you usually lose a combination of fat, lean tissue and water.
Exercise requires energy, and this energy is measured using Calories (or more accurately, kilocalories). Considering 1 pound of fat is the equivalent of 3,500 Calories-you can see that it takes a lot of exercise to burn fat. In addition to this, the source for energy may come from either fat or muscle glycogen. As the body adapts to each exercise, it becomes more efficient in its use of Calories-therefore burning less! The amount of muscle also has an impact on Calories burned.