1, from a biological point of view, people are fat because they have too much fat. Moreover, fat is the backup energy of the human body, and it will only be consumed when the body has no energy at all (usually not much), so you won't consume fat if you are not hungry for a few days. Therefore, if you want to play basketball, although it will consume fat and play the role of losing weight, from a scientific point of view, the effect can not be significant, only persistence will have an effect.

2. From the perspective of human function. The energy transmitted by different parts of each person's body is different, and there will be differences (though small) between people. Maybe your "reserve energy" is sufficient because of this accumulation, but if you exercise at ordinary times, such a thing is impossible.