Incline dumbbell press: arching your back cancels the entire point
In short
The standard setup for the incline dumbbell press is a bench at 45 to 60 degrees, run as the second movement of a chest session right after a flat bench variation, for 3 to 4 sets of 8 to 10 reps. The purpose of the incline is to widen the angle between the upper arm and the torso, which shifts load onto the clavicular fibres of the pecs — the upper chest. Arching the lower back closes that angle again and shortens the press, turning the lift into a worse flat bench performed on a tilted seat.
The prescription for the incline dumbbell press is settled: bench at 45 to 60 degrees, run as the second movement of a chest session immediately after a flat bench variation, 3 to 4 sets of 8 to 10 reps. The problem is that you can follow every part of that and still void the exercise with one postural habit — arching your lower back.
Why is arching the back a problem here?
To load the upper chest — the clavicular fibres of the pectoralis major — you need a wider angle between the upper arm and the torso. Tilting the bench is simply the device that opens that angle. Arch your back and the rib cage rides up with it, closing the angle again and cutting the actual distance the dumbbells travel. What you get is a worse flat bench on a tilted seat: the load goes up, the target region gets missed. This is why Men's Health fitness director Ebenezer Samuel puts so much weight on abdominal bracing for this lift specifically. Squeeze the abs and keep the glutes glued to the seat.
Is pressing out in front the same mistake?
It shares a root. Pushing the dumbbells slightly out in front instead of straight up comes from reading the incline as nothing more than a different angle to lie at. The point is to open the arm-to-torso angle, so the dumbbells start directly above the shoulders and travel vertically with the forearms perpendicular to the floor.
- Drive the feet into the floor, the glutes into the seat, the shoulders into the back pad
- Kick heavy dumbbells up to shoulder height with the knees
- Forearms perpendicular to the floor, dumbbells directly above the shoulders
- Drive the shoulders down into the pad to tighten the shoulder blades, elbows turned slightly forward
- At the top, rotate the hands slightly inward and squeeze
Why dumbbells rather than a barbell?
Because the hands are not fixed to a bar. Unfix them and the range of motion grows, and the shoulder can travel through the scapular plane into a more comfortable position instead of one dictated path. Unilateral and alternating variations only exist with dumbbells, and they buy extra time under tension.
Do the dumbbells need to touch your chest?
Touching is not the goal. The standard is whether the elbows drop below the shoulders and whether you own and control that position. Anything past that depends on your shoulder mobility, and not touching is fine. Once you reach a depth you control, press back up explosively. If lengthening the chest fibres is what you want, do a chest stretch — that is a separate job from pressing.
This is one of the easiest presses on which to put your shoulders at risk. Loose shoulder blades, elbows flaring out and a depth you cannot control stack up into load concentrated at the front of the shoulder. Before adding weight, confirm the shoulders are pinned into the back pad.
It is the flat bench press one-rep max that feeds a relative strength score, not your incline numbers. The incline dumbbell press sits there as the accessory that makes that bench stronger, which is exactly why it follows the flat bench in the session order. If the bench is the weakest of your Big 3, read training your weakest lift alongside this, and check where you currently stand with the calculator.
Frequently asked questions
What incline bench angle is best?
45 to 60 degrees is the working range. It opens the angle between the upper arm and the torso enough to load the clavicular fibres of the pecs. Steeper than that and the lift drifts toward a shoulder press, with the chest taking a smaller share.
Should you arch your back on the incline press?
No. Arching closes the angle between the upper arm and the torso and shortens the press, which defeats the reason you tilted the bench in the first place. Keep the core braced and the glutes on the seat.
Incline press with a barbell or dumbbells?
Dumbbells have the edge. The hands are not fixed to a bar, so the range of motion is larger and the shoulder can move through the scapular plane into a more comfortable position. Unilateral and alternating variations are also only available with dumbbells.
Do you have to lower the dumbbells all the way to your chest?
You do not. Getting the elbows below the shoulders with control is enough, and how much further you go depends on your shoulder mobility. Stretching the chest is the job of a chest stretch, not of a press.
Source: Men's Health