The best exercise for winning an arm-wrestling contest
“The overgrip chinup works your forearms (which will give you a strong grip and wrist strength) as well as your biceps and back (to help you pull your opponent’s arm down).
Do this: Perform a regular chinup using an underhand grip, but use a bar that’s at least 2 inches in diameter. The side of a power rack works well—or simply wrap a towel around a normal-size bar. Do one to three sets of as many repetitions as you can.”