Most commonly, this training split involves 4 workouts a week with each session dedicated to upper and lower-body training in alternating succession, like this:
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• Monday: Upper Body
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• Tuesday: Lower Body
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• Thursday: Upper Body
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• Friday: Lower Body
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Pros: For most lifters, training each muscle group twice a week is much more effective than only once. Many lifters also enjoy the ability to give focused attention to a specific body region for an entire workout.
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Cons: Twice a week may be less than optimal – especially for average to smaller guys who aren't yet in the 1200 club (300 bench, 400 squat, 500 deadlift). Overall, this is a descent split, but there may be an even better way of organizing your training for the week.