The law actually isn't that the arm can't be flexed/bent. It's that the arm can't straiten more than 15 degrees once it's above shoulder height. So you can ha

The law actually isn't that the arm can't be flexed/bent. It's that the arm can't straiten more than 15 degrees once it's above shoulder height. So you can have a bent arm as long as you keep the angle more or less the same.