We feel that it's better to develop things like throat grabs and groin slaps as opposed to toughening up one's calluses on a stationary object, especially in today's world where the average criminal will NOT go down simply because you punched him hard repeatedly.
Heavy bags just teach you how to throw down with power. Your structure MUST be right to have any impact and to avoid hurting yourself, as compared to pad work or light bag work where you can get away with structural deficiencies. That's it. Good stuff as far as it goes, but it's just a tool like any other.
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