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Split the difference! Doing split weight training routines instead of working your whole body each time allows you to do more sets for the body parts you are working and/or spend fewer hours in the gym, although you will be there more days. You can do 6 days a week total, but 4 is enough for most.
Just remember to allow recovery from your weight training program and not work the same muscles 2 days in a row. Typical strength training exercise splits are: upper/lower body; push (chest, shoulders, triceps)/pull (legs, back, biceps); arms, legs, and abs/chest, shoulders, and back.