Norse wrestling.
It survived as a sport on Iceland and is now reintroduced in the Nordic countries.

Glima has three styles . As a sport the fixed forms Back-hold and Trouser-grip. When practicing combat Glima the Free-gripping style is used.

Combat Glima can be fought two different ways:
 
As the sum total of what you have learned and trained, balancing attack and defense to make proficiency and strength work optimally.

Or going berserk, where technique is just the outer part of what you are doing. What you really are going for is winning even before you are coming to grips, by breaking the will of your opponent using a no holds barred attack and no thought whatsoever for defense. By speed and strength you force the opponent to defend himself. And no one can win only by defending. To succeed going berserk the commitment must be absolute, bluffing is impossible. What is mobilized is more than cold calculation, and absence of berserk is felt at once by the opponent.

Going berserk is much more than what is mentioned here. But to really understand you have to do it, reading is not sufficient.

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