Qa'vak was a traditional Klingon test of skill. It was normally done in preparation for the Klingon hunt ritual, which reminded Klingons of where they came from.
The qa'vak involved two Klingons, a half-meter hoop and a spear. One individual rolled the hoop away from the group. The individual being tested would attempt to throw a spear through the hoop while rolling. When successful, the Klingon would shout ka'al!. A useful technique for throwing the spear would be to use the non-throwing hand as a guide for aim.