Outside of a training partner and if you have to pick one (which I think is the essence of the question) then I say heavy bag. If you work it right, it trains all of your tools and develops so many attributes: power, body mechanics, conditioning, footwork, timing, distance etc. In a field where training partners can often let you down, the heavy bag is always there.
Unless she runs off with the wooden dummy, bitch. I still miss her, so if you see her with that three-armed son of a bitch you give me a call.
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