So i have a light bag ~20kg to my 95kg. I mostly use it to get my timing down and my footwork on point.I am pretty tall 1.91m and very heavy as mentioned before, but it seems like i am very weak. when i punch, the bag starts shaking and not moving at all. I can make it move a lot but it is more of a push than a punch. My punches seem pretty fast especially compared to others i know. Am i doing something wrong? Or is it how it's supposed to be (I am a complete beginnertweakbox