Good Grip (hands) leads to good wrist action.
This is one reason that the grip is so important. A faulty grip encourages breaking. One does not have to learn this up/down (hinging) if the grip is correct, and the left arm is in the correct position the hinging will be automatic. . The legs moving forward while the club is still traveling backwards forces the wrists to hinge.
In order for this action to happen keep the left wrist flat in relation to the back of the left forearm and the back of the left hand. It's as simple as that. If the left arm is in the correct position the wrists will hinge, if not there will be a breaking motion. Don't try to cultivate an independent wrist motion. Let it be natural. Swinging the club back farther than shoulder turn forces the wrists into a cupping(breaking)position. Result: A throwing motion.
Next lesson: still more on wrist action.
Please contact me at firstname.lastname@example.org if you have any questions about this wonderful game.