Tuesday is always good for back

Tuesdays have always been a back day, for years.
In high school and college the lifting schedule prescribed to us by the coaches always seemed to be arranged in a 4 day workout schedule

mon & thirs: chest, shoulders, and triceps
tus & fri: back, bi's and legs

This breakdown has many advantages over both a 6 day split (hitting each muscle group once a week) and a 3 day split for the week (hitting all major body parts 3 times a week) One is lifting each major muscle group more than once. Another is you get at least 2 days rest between workouts. While there is a time and place for every kind of training split imaginable the 4 day schedule is great for beginners who want to get their feet wet and is a gradual progression towards specializing workouts. Most people start out with total body workouts, hitting all the muscles in one workout. Doing so ensures the most amount of workouts per muscle group in a week WITH getting at least one day's recuperation.

The only problem with this workout is the sessions cannot be too complex and can't be too specialized or target many muscles. Unless you have all day to be in the gym! In order to take your fitness to the next level you have to change your routine. That's where the four day split comes in. You can add movements in and keep your workout length about the same. These added movements put the emphasis on certain muscle groups such as your back and you can focus on specific muscles within that group such as the Lattissimus Dorsi, Rhomboideus, or lower Trapizius to name a few. This increases muscle growth and strength!