Here is a sample four day split weight training routine that involves four workouts each week, targeting specific muscles each workout.  In this sample, workouts are on Monday, Tuesday, Thursday and Friday with rest days on Wednesday and the weekends.  Of course you can structure this workout around your specific schedule if needed. 

A four day split doesn't offer as much flexibility as a three day training split, but many people prefer a four day split over a three day split because they can focus more on the muscle group being targeted since there are less muscle groups being trained each workout.

The four day split training routine is an excellent workout regimen for bodybuilders of all levels.  However, it may not be the best type of training split for you if you meet any of the following criteria:

• Have a very busy schedule and don't have access to a home gym.

If on the other hand you can make it to the gym four times a week, or have access to home gym equipment in case you can't make it to the gym, then consider giving a four day training split or even a 5 day training split a try.