提高出拳力量的一个方法是挂重袋。 当你拿到包的时候，开始训练。 在日常锻炼出拳时可以增加小哑铃。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Not so heavy that you have no more knuckles after your workout, but not so light that you blast the bag away with your first strike. It's one of those "Goldilocks And The Three Bears” situations: not too much, not too little, just right. Use the tips outlined above about how to improve your technique, and practice them on the punching bag. Remember to really put your hips into each punch. Don't use dumbbells that are challenging for you to lift. Start with 5 or 10 lbs., or perhaps 15 lbs. if you