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In this split, the whole body is worked over a period of four days: Day 1 - Chest/Back. Day 2 - Thighs/Hamstrings. Day 3 - Shoulders/Calves. Day 4 - Biceps/Triceps/Abs. Training Notes. Because this workout splits the body over four days, you can do more sets for each muscle group.
The logic behind this method is that certain muscle groups tend to work together in compound movements. For example, many back exercises are pulling movements that work the back, biceps, and forearms together. That means that it makes a lot of sense to do your back and biceps on the same day.