Pull-ups are an exercise program that uses abdominal and arm strength. If you think your hands are fat and want to lose weight by this, I think it's a bit hanging. Don't think about what effect you can achieve, just look at the exercise itself. Don't you find that this is a very tiring and difficult sport? Do you think you can do it except athletes and sports students?

Furthermore, if you really want to keep fit, why not choose something simple and easy to operate? Like sit-ups, it also exercises people, and 30 squats can also help you lose weight.