Back routines are more strenuous routines with permission legs day. The back is a large muscle group and require a lot of effort to complete mobilization and work your muscles.
In back routines should be used amplitude-oriented exercises, such as chin and milestones but also exercises geared to the density as the paddles.
In one back routine can combine both types of exercises or you can work back twice a week working one day and another day amplitude density, the choice is yours as your target and trainability.
The back is also one of the hardest muscle groups congested by beginners, because it must perform a full range of motion to stretch and contract the muscle properly. Once you can see practice as brutal congestion can get back to work.