With these two exercises, we cover the range of motion that are not covered with the chest press and standing back row.
Other videos you may want to watch:
Beginning Basic 4 Upper Body Exercises
Beginner Basic 4 Upper Body Exercises Keeping Door Anchor at Chest Level
Intermediate Basic 4 Upper Body Exercises
Intermediate Basic 4 Upper Body Exercises Keeping Door Anchor at Chest Level
Advanced Basic 4 Upper Body Exercises
When we do the chest press the arms move in a forward and up motion when in the close or in position of the flying arms motion, with the elbows staying close and inline with the body. When in the open or out position, with the elbows pointing out to the side the upper arms come forward and across the body. But the arms only come to a point of pointing straight out in front of the body as they come across in the open or out position. As the arms come across the body, the shoulder joint would allow the arm to continue across the front of the body if the exercise covered the full range of motion. To cover that crossing on across the front of the body, you can do a cross chest press.
As with the chest press, when we do the regular standing back pull, we start with the arms pointing straight out in front of us to start the movement with the elbows out and to the side of the body. The upper shoulder joint is capable of moving the upper arm much further across the front of the body. To cover that area you can do the cross chest pull.