This little bag costs $30. You could even hang it from a tree. There’s no reason why you shouldn’t be working on defense everyday. Boxing is brutal. Hit and do not get hit! Spend time on the Maize ball. I use a lot of different things to work on defense but if I had to choose only one, I would say go with the Maize ball. You can pretty much do everything with it as far as head movements, blocking and parrying punches.