One of the possible reasons that free people exercising does not seem to add up to weight loss as the lesson can predict is that free people can eat back their burned calories. Some may do so because of increased hunger. Others in a sense of virtue and the tendency to be rewarded for their hard work. Others still because marketing has convinced them refueling, recovery, replenishment, etc..
A new study,Energy expenditure on activity is an independent predictor for energy intake in humans, published this year in the International Journal of Obesity, has set the goal for this phenomenon.
Now, to be clear, the study was certainly not designed to explain the impact on weight. It takes just 7 days to look at retrospective analysis of data from 5 previous studies and did not directly measure energy consumption or energy consumption. However, researchers used estimated energy expenditure through heart rate data and indirect calorimetry and energy uptake through well-known problem food diaries.
My statistics skills are not close enough to comment on the different data processing but here is the scattered graph of the impact of energy expenditure on energy consumption.
The increase in the energy intake of the authors attributed to energy expenditure was not high, about 3% of the total daily calories (about 70 in this sample), too small to explain the unusual effects of exercise on weight loss.
Indeed, I would have predicted that the difference would be greater as eating more followers in exercise is something I know many people for one or more of the various reasons mentioned above.
Naturally, none of these changes the fact that exercise has tremendous health benefits at any weight and that weight should not be your guide to lifting your own if you are able.