Dude, don't worry, you are sure to have many side effects. When practicing boxing, you should hit sandbags, and increase the hardness of your fist by hitting sandbags or sandbags with different hardness. Generally speaking, we should start with soft foam sandbags, followed by hard yellow sand belts, and then practice for a long time, and 30 thousand punches a day will be lost in sandbags, so we can hit iron sandbags. As for losing weight, if you add kicking, the effect will be higher. I'll give you 50 kilograms for two weeks.