Arm wrestling
Arm wrestling was a physical game played on Earth in which opponents attempted to force the other person's hand to the table or other surface being used. Sullivan's Public House was a common place for this game. Harry Kim once defeated an opponent Liam, who seemed to be much more powerful than him. ()

Klingons raised the stakes by having a d'k tahg on either side of the arms. Thus, whoever lost got their hand impaled. ()

See also 
 B'aht Qul challenge

External link 
 
Exercise