Below is a list of my top 4 exercises for an Upper Body Warm Up.
I advise completing 2 rounds/sets of these 4 exercises before training.
Banded Shoulder Dislocators
Exercise A
2 sets x 20 reps
Half Kneeling Banded T-Spine Rotation
Exercise B
2 sets x 10 reps per side
Banded Lat Row
Exercise C
2 sets x 20 reps
W-Raises
Exercise D
2 sets x 10-15 reps