Most gym rats are “pushers,” not “pullers”—and most do too much horizontal pushing and not enough vertical pushing.
If you’re able to press 100-pound dumbbells lying flat on your back, then you should be able to press 70-pound dumbbells overhead for the same number of reps. For every pushing pattern you perform, you should also include the corresponding pulling pattern. For example, a great antagonist for the standing one-arm dumbbell press is the half-kneeling one-arm cable pulldown.
On page 66 of The Elite Trainer, I discuss how pressing strength decreases an average of 2–7% every 15 degrees from a decline, lying position to an upright, seated position. In the example above, you also have to factor in a standing versus seated position along with the bilateral deficit—but the point remains: If there’s a huge discrepancy between your horizontal and vertical pressing strength, your body won’t look or function properly, and you’re setting yourself up for injury.
Likewise, if you prefer having rounded shoulders and a forward head, just keep pushing without pulling!

The Elite Trainer: Strength Training for the Serious Professional
The Elite Trainer is a synthesis of the very latest thinking in strength training and a comprehensive guide to developing individualized programs for your clients.
Intensity, volume, density, repetitions, sets, tempo, time under tension, rest interval, exercise selection and sequence, load selection, duration, and frequency are all covered in detail in easy-to-understand language. Whether you are a seasoned professional or a beginner, The Elite Trainer provides a wealth of information you can put to use immediately.