If you’ve spent any time in the gym, you’ve likely seen different training splits. Some people train their full body every session, while others focus on just one muscle group per day. One of the most effective and popular approaches, particularly for building muscle, is the 4-day upper-lower split.
This guide provides an insightful look into how the 4-day upper-lower split works and why it’s a superior choice for hypertrophy, which is the scientific term for muscle growth. You’ll learn how to structure your routine, choose the best exercises, and manage rest to maximize your results.
The 4-day upper-lower split divides your training week into two upper-body days and two lower-body days. This structure allows you to train your entire body twice a week, which is considered optimal for muscle growth for most intermediate and advanced lifters (1).
On upper-body days, you focus on muscles such as the chest, back, shoulders, biceps, and triceps. On lower-body days, you target the quadriceps, hamstrings, glutes, and calves. The goal is to stimulate muscle protein synthesis (MPS), the process your body uses to repair and build muscle, more frequently without causing excessive fatigue (2).
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