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It is important for you to know that the more your heavy bag swings does not mean your punches are stronger. Many people (included me) have developed bad punching technique because they want to knock the bag further. As a result, many people develop 'pushy' or soft punches. Ya, their punches have force, but they lack impulse and therefore in some cases only push their opponents back. You should be paying attention to how deep your fist penetrates the surface and forget about how far it swings. And most of all, ask you instructor to help you develop correct technique. I hope I have helped you. Good luck.