You feel it after the first few kilometres: your calves are working, your breathing gets shorter and your mind searches for a rhythm. The stage is short, but the road climbs almost all day through the La Espina valley. Climbing more than 500 metres over such a short distance really adds up.
So take it easy. Stop whenever you like and look around you. The valley keeps shrinking beneath you, and after the highest point things become a lot friendlier. Then you descend into Camasobres. You put your rucksack down, take off your boots and give your legs a rest.