Split routines are almost always the most effective way to train. The more advanced you become, the more you'll need to split up your workouts and the more time you'll need between training each body part.
Training your entire body in one session is ok when you're a total beginner, but the longer you've been training, the less efficient these full body workouts become. A full body routine performed three days per week is probably the best way for a beginner to start weight training, but it gets "old" fast. Within just months, you will outgrow it and you'll need to add exercises.
As you advance, you need additional exercises to work each muscle group completely. For example, a muscle like the deltoid has three heads, anterior, medial and posterior. For complete overall muscle development, you need to work all three heads. The problem is, the more exercises you add, the longer your workouts will become. If your workouts get too long, you reach a point of diminishing returns, and ultimately, the excessive duration has a negative impact on your results.
Split routines are the solution. A split routine allows you to perform multiple exercises on each body part without spending all day in the gym. Split routines also allow you to concentrate your mental and physical energies more efficiently. Training your entire body, or even half of your body in a single session is exhausting, mentally and physically. When you only have to work two or three muscle groups per session, you not only finish more quickly, but you can also give more energy and intensity to each muscle group. If you have to train too many body parts in one session, whatever you do last is going to suffer because you run out of energy.
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Fit exercise into your busy schedule? Thats as absurd as saying that there are eight days in a week! First, youve never exercised before or engaged regularly in a sport second, youve never been into the fitness crowd and have had meager time for such pursuits, and third, youre far too busy to even think of exercise.