Somebody at the gym watches your Romanian deadlifts and offers the classic upgrade: "you could go deeper." And it's true — you could. Bend a little more at the waist, let the bar ride down toward your shoelaces, feel the extra stretch. Deeper equals better, right? That's how squats work.
Not this lift. The RDL has a defined destination, and it's closer than most people think: the bar slides down your thighs to just below the knee. That's not the beginner version. That's the rep.
Where RDL depth is allowed to come from
The Romanian deadlift is a hinge-patterning lift. Its entire purpose is to load the hamstrings while the spine holds one unchanging shape — you push the hips back, knees staying soft, and the bar travels down the front of your legs exactly as far as your hamstrings can lengthen while that shape holds. Then the hips drive through and you stand.
Which means depth in an RDL is earned by hamstrings, never by the spine. Read that twice, because it's the whole article. The moment your hamstrings reach the end of their stretch, the rep has found its bottom — for you, today. Any additional depth past that point has to come from somewhere, and there are only two donors available: the spine rounds forward, or the knees bend and turn the lift into something else. Both purchases buy you inches of depth by selling the exact thing the RDL exists to train.
So the deep-looking RDL that touches the floor with straight legs is very often a spine curling at the bottom of every rep — the hinge-patterning lift diligently rehearsing the pattern you're trying to retire.
How to find your bottom
Do a slow rep and listen to the back of your legs. Somewhere mid-thigh, the hamstrings begin to speak; by just below the knee, they should be genuinely loud — a strong drawn-bow tension. The bottom of your RDL is where that tension peaks while your spine still holds its shape. For most lifters that lands right around just-below-the-knee. If yours arrives a bit higher, that's your rep today — the range grows as the hamstrings adapt, which is exactly the sort of progress this lift is for. Chasing the range with your spine skips the adaptation and the point.
Hips back, not down, is the other half: the RDL's knees stay soft and bend only slightly. If your knees fold forward as you descend, depth is being minted by a bank that shouldn't be issuing it.
The drill — the RDL itself, done to standard
The fix for RDL depth is simply RDLs with the honest bottom: 3 sets of 8, light to moderate. From the top, push the hips back, slide the bar to just below the knee — spine holding one shape, hamstrings loudly loaded — then drive the hips through. Choose weights by the quality of the stretch, not the number on the plates. A lighter RDL with a true hinge builds more pull than a heavier one that buys depth from your spine.
Depth-borrowing is nearly impossible to feel — the extra inches feel like flexibility, not compromise. From the side on video it's unmistakable: does the spine hold its line at the bottom, or curl to reach? Film a set side-on and CoachVision's AI coach will grade the RDL by its own standard — hinge depth, held spine shape, bar to just below the knee — and give you a measured read on where your real bottom lives. Eight reps, hamstrings loud, spine quiet. That's a full-depth RDL.