Um not 100 certain but probably the three or four main ones
1 Technique
If you lose perfect technique and get into bad habits that's the worse thing for you on a couple of levels (self damage on the bag and bad ring habits are hard to break.
2 Warm ups and Stretches before real hard work.
Cardio I suppose ?
Diet @ 4
Better guys than me in here will tell you the whats and whens.
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