Quote Originally Posted by Scrap
Iv;e got this heavyweight 108kilo 6ft5in who punches his weight and, a 80lb bag is ample for him. Its how you use the bag,if the bag is moving, next time you hit it stop it from moving.Keep your distance, by using your feet
Thats what I like to do, if the bag is moving, rather than trying to keep it moving I'll move in and out of range until I'm in a position to catch the bag as its coming towards me and stop it moving. before repositioning myself for another angle.

If you do it that way it means your punching against the bag which if I understand correctly makes it alot harder than if the bag is still or swinging away from you because the resistance multiplys.