I would train each bodypart twice a week, something like this:
Mon/Thurs - Torso
Tues/Fri - Limbs
I'm 22, 5'2" female, about 125 lbs. I want to lose 5-10 lbs, hopefully by June, and I want to gain muscle. I was wondering what was better, to work one muscle group longer one day a week, or do a full body workout 3 times a week (so Chest/Shoulder/Tricep on Monday, Legs on Wednesday, Back/Bicep on Friday....or work the whole body three times a week). I really want to see results.
I would train each bodypart twice a week, something like this:
Mon/Thurs - Torso
Tues/Fri - Limbs


Fullbody split. Still split different movement types up, but work both upper and lower body each workout day. Requires more "conditioning" and increases metabolic activity because you're working a lot of disparate muscle groups in same time period.
Split is only a small piece of the puzzle though. I would read the training stickies on how to design programs for an idea of what else you need to think about.
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Look into HIIT. See if you like that. If you do like that then stick to a full body routine. Also shape up your diet if it isn't already in good shape.
"A child does not learn to squat from the top down -- in other words, he does not suddenly make a conscious decision one day to squat. Actually, he is squatting one day and makes the conscious decision to stand." - Gray Cook
Full body 2-3 times a week, using alternating supersets with parts far apart from each other, like:
Snatch Grip Deadlift
Dips (Do one set of deads, rest 60 seconds, one set of dips, rest 60 repeat for a few sets, for each superset)
Squats
Chinups
Side Lunges
Ab Circuit
Throw in intervals, boxing/any sport, some sled dragging and a good diet and you're set.
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