so I have read/heard about runners in winter conditions carrying ice axes on particularly grim and excessively nasty/slippery days in the hills.
as a walker I would carry a 55cm axe, but have never really thought about running with one.
If a runner were to decide to take this as a necessary extra, is the "correct" (or should that be "advised") length, the same as a walking axe, or is it simply the lightest and shortest that you can get yer hands on?