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I'd definately differentiate between superficial damage (light bruising, scratches etc) and damage that causes you loss of function (muscle/ligament tears, breaks etc) - the former being acceptable in training. I'd also say that a good punch in the face is useful training since it shows you the effect it has - however the dojo is maybe not the best place to do this.
Ian
P.S. yonkyo often makes my wrists 'buzz' for a couple of days afterwards, but I don't see this as 'injury'.
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