The Primitivo killed me. Of course I was 66 at the time. I quit half way through and went to Lugo, then to Ferrol to do the Ingles instead which was not easy but I could make it. The easiest Camino I have done was the Portuguese.
It is the damn elevations on the Primitivo!
Almost every morning out of places like Pola de Allende, you have a 600-700 meter climbs over the first 5-6 kilometers to get out of the valleys where the towns are and onto the Camino ridges. The terrain is very beautiful and very extreme with deep gorges everywhere. Also if you go in February much of the infrastructure is closed!
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This is more like a path for mountain goats! Only do the Primitivo if you are in very good condition. It is the most beautiful however.