The Overhead Press Cheat: Are You Actually Lifting with Your Lower Back?

When you are reaching up to grab a heavy box from the top shelf, or pushing a barbell overhead in the gym, the goal is simple: get your arms straight up into the air.

But if you feel a tight, stiff ache in your lower back the day after a heavy lifting session—or even just a long day of reaching and stacking—you might be falling for a classic movement trick. You think you’re training your shoulders, but your body is actually using a sneaky workaround that leaves your spine taking the beating.

It’s called rib flare, and it is one of the most common blind spots in overhead movement.

The Illusion of Shoulder Mobility

To get your arms completely vertical without changing your posture, your shoulder joints need a specific amount of clean, uninhibited clearance. But because most of us spend our days hunched over desks or steering wheels, that overhead mobility gets restricted.

When you go to press a weight overhead, your brain hits a mechanical roadblock. Your shoulders literally run out of room. But because your brain is stubborn and just wants to complete the movement, it finds a cheap workaround: it tells your lower back to arch dramatically.

By dumping your pelvis forward and letting your front ribs "flare" open toward the ceiling, you tilt your entire torso backward. This structural shift instantly changes the angle of your chest, allowing you to lock the weight out overhead.

The problem? You didn't actually get your arms higher using your shoulders. You just hyperextended your spine to fake the range of motion. Instead of your upper back and shoulders supporting the load, the entire weight of that press gets jammed directly into the joints of your lower back.

The Wall Press Test

You can check to see if your body is using this rib-flare cheat right now with a quick test against any flat wall.

Stand with your heels, butt, upper back, and the back of your head firmly glued to the drywall. Take a deep breath in, exhale completely, and feel your front ribs drop down and flatten. Your lower back should be almost flat against the wall, with barely enough space to slip a hand behind it.

Now, keeping your lower back and ribs completely frozen against the wall, try to raise both arms straight up until your thumbs touch the drywall above you.

• The Goal: Your arms should reach the wall easily without your ribs popping forward or your lower back arching away from the drywall.

• The Flare: If your lower back instantly pulls away from the wall the second your elbows pass your ears, your body is hardwired to cheat the overhead press. You are trading spinal stability just to fake shoulder mobility.

  
  

Locking Down the Foundation

At Defiance PT and Wellness, we bridge the gap between clinical precision and high-performance training by cleaning up these subtle power leaks before they turn into chronic wear and tear.

We don't just look at how much weight you can push overhead. We look at what your spine is doing to get it there.

Through targeted one-on-one personal training and precise movement coaching, we help you un-jam restricted shoulders while teaching your core how to keep your ribs locked down under a load. By fixing the relationship between your ribcage and your pelvis, we ensure that your shoulders do the actual lifting and your spine stays entirely protected—allowing you to build real, functional power without the nagging back stiffness.