a compulsory pose.The competitor may choose either side for this pose, in order to display the "better" arm. He will stand with his left or right side towards the judges and will bend the arm nearest the judges to a right-angle position, with the fist clenched and, with the other hand, will grasp the wrist. The leg nearest the judges will be bent at the knee and will rest on the toes. The competitor will then expand the chest and by upward pressure of the front bent arm and contract the biceps as much as possible. He will also contract the thigh muscles, in particular, the biceps femoris group, and by downward pressure on his toes, will display the contracted calf muscles.
For pics and more see
IFBB website .