The RDL is the purest form of a hinging pattern and the easiest way to teach someone how to use their hips, glutes, and hamstrings independent of their spine. I would say that’s a pretty objective opinion of mine seeing as you’re minimizing complexity of the movement by all but eliminating the contribution at the knee. In terms of complex movements, it’s a pretty simple one.
I will start most people with an RDL, even if they already have lifting experience. Well, maybe especially if they have lifting experience because, often times, I need to re-teach their hip hinge.
Now, once you know this, I’m generally going to throw on more complexity. For example, when you can demonstrate a consistently (or semi-consistently) clean RDL pattern, I’m going to then have you RDL the weight to the knee, then squat the weight down to the floor.
Ta da! Then we have a deadlift pattern.
The RDL is a fundamental movement that I need all of my clients to know, and it’s arguably the easiest way to teach hip extension while keeping the acetabulum over the femoral head.