In fact, the first month of losing weight is mainly diet control, and then exercise. First, you should eat less, so that you don't need to consume so much and you don't need so much relative exercise. You seem to be the other way around.
In fact, even if you don't exercise, you can lose weight by controlling your diet. For example, you can eat less starch for dinner. Eat more fruits and vegetables, drink more water, and give up snacks and drinks.
But the best way to lose weight is to combine diet with exercise. Exercise doesn't mean you have to run or jump. In fact, going shopping on the stairs is generally exercise, but it takes half an hour to be effective.
Generally speaking, it is important to control diet. As long as it is well controlled, the weight will not rebound, but exercise will make the body better and lose weight faster.