The equation is simple: lose weight when you eat fewer calories than our body.Consumption is given by the usual metabolic processes as well as exercise.
Each pound of fat stores around 7700 calories, considering that the average man consume per day between 1500 and 2500.
An hour of intense workout can burn about 250-500kcal. So it takes about 15-30 hours of training to use the 7700kcal a pound of fat. That given that diet and daily activities the rest remain constant. This is why a method that claims to burn fat without diet and /or no effort is not just a trick of those trying to sell a wonderful product, or simply disinformation.