The Army-Backed Move Guaranteed to Build Your Core and Chest
If you want to build a rock-solid core and strengthen your chest, there's no better person to learn from than a U.S. Army strength coach. Army Reserve Lt. Col. Jason Barber, PA-C, CSCS, TSAC-F, has spent over a decade at the World Class Athlete Program (WCAP), where he's helped to consistently qualify more than 10 athletes for every Olympic and Paralympic Games across eight different sports.
According to Barber, if there's one exercise he swears by for core stability and upper-body strength, it's the stability ball dumbbell chest press. It forces you to engage your core through the full range of motion while also working your chest, shoulders, and triceps. While it's a go-to for novice lifters working on core control and balance, this move delivers benefits for athletes at any level.
"When I started as a young strength coach, one of the biggest things that I always glommed onto was building the foundation," Barber says. "And that core development is truly the foundation. Making our bodies more unstable means that we have to incorporate more accessory muscles and more core stability in order to move the weight that we're trying to move."
Hold a dumbbell in one hand and lie back on a stability ball as if you were going to perform a bench press, using your core to keep your butt from sinking down, to start.
Press the weight straight overhead while maintaining your balance.
Do not allow your body to rotate to one side. Reverse the motion to return to the starting position. That's one rep. Complete all your reps on that side and then switch sides and repeat.
"I like adding things like that into programs," Barber adds. "I think it's good for everyone to think about that and think holistically about how they train, not just biceps and triceps and chest. So, I'm a huge advocate for those types of modalities."
The stability ball chest press and traditional dumbbell bench press have a similar setup and may look alike, but they activate the body in very different ways. The flat bench used in a standard dumbbell chest press provides a stable base, allowing you to focus purely on pressing power, which means you can typically move more weight.
The stability ball version, on the other hand, forces your entire body to work. Your core, glutes, and even legs stay engaged throughout the movement to keep you balanced on the unstable surface, turning a simple chest press into a full-body challenge.
'All of the muscles that are in my back and my hips and my legs, my core, my abdomen, and then even using some more, like, accessory shoulder muscles to accommodate the dumbbell, are being used," Barber adds. "That's a whole-body lift, almost. Whereas before, if we're in the traditional bench, we're pretty locked in, and it's really just a chest exercise.'
Although most people who've been lifting for a while assume their bench press weight will translate directly to the stability ball, they're wrong. Because the ball is free-moving, it requires a different movement pattern and a whole lot more control. Below, Barber breaks down the two most common mistakes he sees people make when performing this exercise.
"Guys usually pick up too much weight," he says. "It's always good to be conservative first, so that's a big common mistake that I'll see, is too much weight, which puts you in danger."
Lying down on a stability ball takes some getting used to. Add dumbbells, and it gets even trickier. One of the most common mistakes Barber sees is lifters arching their bodies over the ball instead of keeping a flat, supported back. This usually means you're either too far off the ball or not engaging the right muscles. To fix it, position your shoulders on the ball—not your glutes or mid-back—to create a stable base and maintain proper alignment throughout the movement. Squeeze your glutes and core to support yourself, and aim to keep the top of your core flat and even with your knees.
The Army-Backed Move Guaranteed to Build Your Core and Chest first appeared on Men's Journal on Jun 24, 2025
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