Heh, there are so many ways its ridiculous. Using the half step method from xingyi works amazingly well, and it can be done on short distances. The back leg is positioned at 45 degree angle while you spring off of it, even if slightly, your front foot lands at the exact same time as your punch, creating a stomping effect in which you draw your power from the ground, your back leg moves up in half step along with the front leg to regain balance.
You can use your front foot as a pivot point, but in my case I relax my entire body and simply shoot out my arm with full mental intention. The movement becomes natural, and not only is your waist behind it, but your legs are also driving the punch. Since it all happens at once, there is no telegraphing. The rooting is there for me so I don't think much about it.