In this video from Russ Anber from Rivalbox, he explains how to throw a jab in boxing. He says this is the most important thing to know in boxing. He stresses it's important to throw the punch from the shoulder. He uses a model to demonstrate the punch. He also says he likes when your feet are on the floor when you're throwing the punch. And he says it's key that the front foot must be in front of the head. This brings you all your balance. Viewers of this video will learn how to throw a proper left jab.