B'aht Qul challenge

The B'aht Qul challenge is a recreational game employed by Klingons which is a contest of strength. The game involves two individuals with one placing their arms forward and the other placing the arms inbetween the first persons with the wrists touching. The first person attempts to press the arms together while the other must force them apart. The first person to succeed wins the challenge. (TNG episode: The Chase)