There are some people that lift twice a day. I've heard of them, but never seen them, and I certainly don't know many. I guess the question you'd have to answer is why you want to lift twice a day, and what you expect to gain from lifting twice a day that you wouldn't gain from lifting once a day or even less frequently than that.
If you're what I call an average Joe (i.e. the average person in the gym, who's lifting weights for general health and looks, as opposed to athletic performance), lifting twice a day may be more detrimental to achieving your goals (depending on your athletic/training background). You may make yourself more prone to injury and put yourself at risk of overtraining (depending on the intensity at which you decide to lift), which means it's quite possible to move backwards from your goal.
Remember that growth and recovery (which is usually what people are looking for) occurs during REST, not during activity. Lifting is simply the stimulus, not the growth itself.
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