Ah yes, how could I forget the finger pushups?

I only use knuckle press ups to work the exact muscles used in punching (more or less), but I dont find they do much for the hands, but like I said they're good for muscle isolation.

Tameshiwari (breaking) is also good, not for actual conditioning but checking your progress (not just conditioning but also power, focus, technique, etc).
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The way of the warrior is a resolute acceptance of death. -Musashi