Walkers are walkers: it's easily defined. And climbers are climbers: even more distinct. But somewhere between the two there lies a semi-vertical twilight zone; where walkers employ hands as well as feet in order to keep heading upwards. In its simplest form, it's a steep, rocky section somewhere along the voie normale where the hands are suddenly brought into play, and a few simple climbing moves are needed to keep the show on the road.