Most lifters classify upper-body pulling exercises as either vertical (think pulldowns) or horizontal (think barbell rows). But what about diagonal? Your program should include all three types. Here are two examples of diagonal pulling:
Leaning Lat Pulldown
One-Arm Cable Angled Row
Think of these exercises as complements to the diagonal pushing exercises you do, like the incline bench press. Pulling in all three directions creates a slightly different loading stimulus for strength and muscle growth.