A few years ago, I often took 1 hour spinning lessons, then ran on the treadmill for 15 minutes between classes, and then took 1 hour spinning lessons ..... Then I swam a mile in the swimming pool. My heart rate monitor shows that I burned about 2 100 calories. Although I don't think I ate those calories back, I haven't lost much weight.
Some people think that I am increasing muscle and glycogen content. Let me get this straight: I didn't start to lose weight, and I didn't start to look thinner until I put exercise in a secondary position and focused on the most critical factor of losing weight: diet-diet-diet! ! ! ! !
The answer to every question on Quora is "If I lose weight?" Every question is "We don't know". There are no exceptions. However, the word "fast" was added to change it. This changed the answer to "probably not".
You can't lose weight just by changing one thing. Unless your weight is stable for a long time, unless something increases your calorie consumption or decreases your calorie intake, unless that is the only thing you really change-it is almost impossible.
You don't lose weight "fast", unless you are already very heavy, 75 kg or more overweight, you are still very healthy, and you need some other things, including a lot of efforts to make some major lifestyle changes. People who change things just to lose weight are usually not the kind of people who can succeed through hard work.