When you become more advanced in your weight training (after the first 3-6 months of regular training), you can use split routines to intensify your workouts, and to give your muscles more time for recovery and growth.

Intensive training requires 2-4 exercises per muscle group. It takes too much time to do all exercises in one session. Shorter workouts (45-70 minutes) are more efficient than longer ones. The solution: split your full-body routine into several days.

If you are a beginner, you are resuming your workouts after some time off, or you have little time to exercise, select 1 - full-body workout (no split).