I often use a special via ferrata kit, the Skylotec Skyrider. If used correctly on steel cable of appropriate diameter, the special attachment device automatically clamps onto the steel cable if pulled in the downward direction. Something like how a one-way pulley (e.g. MicroTraxion) works to provide a self-belay capability on nylon rope.
So instead of falling down below the next lower cable attachment anchor point, I fall only as far as the length of the lanyard below the special attachment device (which hopefully I had pushed higher up along the cable above me before I tried some difficult or strenuous move).
I like to use it when I'm trying "free" climbing moves with my hands and feet directly on the rock (using the steel cable only for protection, not aid). I've done some rather fun interesting sections of Via Ferrata routes with "free" climbing moves in the range of Euro grade 5c to 6b in this way. Some of my favorites are VF Les Perrons (Venosc + L2A France) and VF Cesco Tomaselli (by Falzarego+Lagazuoi Italy)
Ken
P.S. A serious concern when taking a fall with most VF kits other than the Skylotec Skyrider is not only the impact on spine or pelvis -- but also hitting a protruding obstacle below such as a rock horn or ledge -- or one of the VF cable anchors.
Post edited at 03:02