Just starting out, your best bet is to throw your jab properly at all times. When you start worrying doing it fast, flicking it out and bringing it back part way, etc...you are talking about teaching yourself bad habits. I can almost guarantee you that you will, before long, be asking why you keep getting hit with right hands. Keep in mind that doubling up on a jab has a lot more to do with strategy than with hand speed.
Something to keep in mind about Hearns and the way he used his jab. He got away with a lot, some of it due to his height, but most of it due to his right hand. Trying to do what he did, without understanding that, will get you into trouble.
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