An adjustable bench changes its backrest angle one of two ways: a ladder (notch) bracket that the backrest arm drops into, or a pop-pin (detent) you pull to slide the pad to a new position. A ladder is a solid mechanical stop with essentially zero wobble and almost nothing to fail, but you usually lift and reposition the pad to change angle and your angles are fixed by the notches. A pop-pin is faster to change on the fly and often gives you more positions, at the cost of one extra moving part and a little potential play if the pin fits loosely. For a rock-solid heavy press the ladder is the safer bet; for frequent angle changes and accessory work the pop-pin is friendlier.
The ladder (notch) system
A ladder bench uses a toothed bracket — a strip of stepped notches, like the rungs of a ladder — welded to the frame under the backrest. The arm that carries the backrest pad simply drops into one of those notches and rests there. That is the whole mechanism. Because the arm is seated in a solid, fixed notch and gravity plus your bodyweight press it down into that stop, the angle holds with essentially zero wobble. There is no spring, no pin, no small part carrying the load — just steel resting in steel. That is why a well-built ladder bench feels so planted under a heavy set: nothing can shift because there is nothing to shift.
The other advantage is durability by simplicity. A ladder has very few parts to fail. It cannot lose a pin, the spring cannot wear out because there is no spring, and there is no small component quietly taking the strain of every rep. The trade-off is convenience. To change angle you typically have to lift the backrest and reposition the arm into a different notch, sometimes rocking the pad forward to unseat it first — a few seconds of fuss rather than a one-handed flick. And your available angles are fixed: the number and spacing of the notches decide exactly which positions you get. If a bench has, say, six notches, you have six backrest angles, no in-betweens. For most lifters that is plenty, but it is worth counting the notches and checking that the angles you actually want are among them before you buy.
The pop-pin (detent) system
A pop-pin bench — also called a detent or pull-pin design — uses a spring-loaded pin that passes through aligned holes in the frame and the backrest support. You pull the pin out, slide the backrest to the angle you want, and let the pin snap back into the next set of holes. The appeal is speed and convenience: you can change angle quickly, often with one hand, without lifting and re-seating the whole pad. Pop-pin systems also tend to offer more angle positions than a ladder, because it is easy to drill many closely spaced holes along the travel, giving you finer control over the exact incline.
The costs are real but modest. A pop-pin adds a moving part — the pin and its spring — and the whole system depends on that pin fitting its holes tightly. When the fit is snug, a pop-pin can feel just as solid as a ladder. When it is loose, or after the holes wear slightly over years of use, the pin can allow a little play or rattle — a small amount of movement in the backrest that a ladder simply does not have, because a notch is a continuous surface while a pin bears on the edges of round holes. It is rarely dangerous on a decent bench, but it is the reason a pop-pin can feel a touch less planted than a ladder under a maximal press. There is also the practical point that a pin is a small part you must not lose, and a spring is one more thing that can, eventually, weaken.
How the two compare
Line them up on the four things that matter and the picture is clear. Rigidity: the ladder wins, because a solid notch carrying load through steel-on-steel contact cannot develop the play a worn or loose pin might. Number of angles: the pop-pin usually wins, since closely spaced holes give more positions than a handful of notches. Speed of changing: the pop-pin wins clearly — pull, slide, release — versus lifting and re-seating a ladder arm. Long-term durability: the ladder has the edge on paper because it has fewer parts to fail, though a quality pop-pin will still last for many years. None of this makes either design bad; they are simply tuned differently. A good ladder bench and a good pop-pin bench are both perfectly capable tools — the question is which set of trade-offs fits how you train.
Which one should you buy?
If your priority is a rock-solid platform for heavy pressing — you want the backrest to feel like part of the floor when you are grinding out a top set — a well-made ladder bench is the safer bet. The solid mechanical stop and minimal parts give you confidence that nothing will shift under load, and you probably do not change angle mid-workout often enough for the slower adjustment to matter. If instead you change angle frequently— flowing between flat, low incline, and steep incline across dumbbell work, or running accessory circuits where you re-angle the pad set to set — the pop-pin’s speed and extra positions make training smoother, and any small trade in rigidity is one most lifters never notice at accessory loads. Neither choice is wrong; it is about matching the mechanism to your session.
This decision sits inside the larger bench decision, so keep it in proportion. Our guide to choosing a weight bench walks through frame, pad, capacity and footprint, and it is worth deciding first whether you even need the angles at all — our flat vs adjustable bench comparison covers that call. If you do go adjustable, understanding what each backrest angle actually trainstells you how many positions you genuinely need, which feeds straight back into the ladder-versus-pop-pin question: someone who only ever uses flat, 30° and 45° is well served by a simple ladder, while someone chasing fine incline control leans toward a pop-pin.
A note on folding benches and the seat gap
Compact folding benches show both mechanisms in the wild. A popular example is the folding multi-position style covered in our FLYBIRD WB5 bench review, where the adjustment system and how firmly it locks are a big part of how solid the bench feels in use. When you compare models in our best adjustable bench roundup, note which mechanism each one uses and read how it holds up under load, not just how many positions it lists on the box. And keep one thing separate in your head: the seat-to-back gap — the space between the seat pad and the backrest pad — is a different design point entirely. It comes from how the pads are laid out, not from whether the bench uses a ladder or a pop-pin, so check it on its own regardless of the adjustment style, since a large gap can leave your lower back unsupported on incline work. Sort the mechanism, sort the gap, and you have covered the two details that most often separate a bench that feels planted from one that does not.
Sources
- General adjustable-bench mechanism principles — how ladder (notch/bracket) and pop-pin (detent/pull-pin) backrest adjustments work, and how each affects rigidity, available angles, adjustment speed and long-term durability — as reflected in common bench design and manufacturer specifications linked from our roundups.
- Our testing and evaluation approach for benches and their adjustment systems, as covered in our methodology.