Wikipedia
Lausatök is the most aggressive form of armed and unarmed Glima, the name of the Scandinavian martial arts system used by the Vikings over 1,200 years ago. The word glíma in Old Norse means glimpse or flash, which describes the systems techniques.
Lausatök (Loose-Grip or Free-Grip) is by far the most widespread form of Glima practiced in Norway, Europe and North America, and there are regular competitions in this form of Glima such as the Norwegian Glima Championship. In Lausatök Loose-Grip wrestling, the contestants may use the holds they wish, and it is practised both outdoors and indoors year round in Scandinavia. This style was banned in Iceland for a period of about 100 years before being taken up again recently.
Lausatök, or Løse-tak in Norwegian, is quite aggressive and differs in many ways from the other styles of Viking wrestling. Lausatök comes in two forms: A version for self-defence/combat and a sport version for friendly competition. In both, all kinds of wrestling techniques are allowed, but in the friendly version they are still taught to be executed in a way so they won’t cause the opponent injury.