Well, Jedriličar, you have no idea what you're talking about. That's exactly why you climb with dynamic rope, so that there is no spine breakage. I don't know what isn't clear to you. I have a feeling that for you climbing with dynamic rope is the same as climbing with a sling.
Somewhere I read that on this forum users are being misled; well, this post by Jedriličar is one such, but here thank God for ignorance.
I'll explain once more: the human body during a fall withstands an impact force of 15G or translated 13kN of force. At this force, injuries already occur that are still compatible with life. Of course, I'm talking about a fall onto the rope, without hitting rocks etc. In a fall onto dynamic rope (height doesn't matter at all) at Fp=2, the force on the body is between 6 and 8kN, well below the injury threshold. Whether the stance holds or not has nothing to do with it, because we're talking about ropes. A fall onto static rope at Fp=2 means a force on the body of 17kN!!! So you're definitely dead or at least seriously injured. That height doesn't matter is shown by the fact that these anomalies, i.e., forces, start appearing already at 1 meter height. Now the best thing, which I often see on via ferratas. Securing with an auxiliary cord. Example: Auxiliary cord (elasticity somewhere between dynamic and static) is about 0.5m long. The hiker, clipped in vertically with a karabiner, climbs from piton to the next piton 10m and falls just below the latter. Fp=fall height/rope length=10/0.5=20!!
So fall factor 20!!!! Nobody survives that. Now it will probably be clear to you why there are so many problems because of ferrata kits. Lately, quite a few systems have been withdrawn from sale. With such a factor, it's an art to make a system that reduces the deadly force to a survival force. Jedriličar, google and surf, you'll find everything.
That's enough. Oh, and this: dynamic rope has about 12% stretch, static 5%, auxiliary somewhere in between.
Be safe!
Lp Jure