In reply to HammondR:
I'm not dismissing this but are you saying this from personal experience?
I used to ice climb a lot when I lived in Finland, most weekends, at least 4 months a year. I've not ice climbed in southern Norway but from pictures I've seen of Rjuken it looks quite similar to Finnish ice climbing - mainly single pitch, lots of step off the flat onto vertical or steep ice, finish by coming off the steep immediately on to flat or much easier angled ground, and tree above for belays and abbing off.
For someone who is an active rock climber but has never even put crampons on before, I think technique is by far the biggest hurdle to get over rather than fitness. You can be as strong as an ox, but it won't help much if you can't use you feet (anyone else remember Gresham's superb and hilarious essay in OTE back in the early 90s about going ice climbing in Glencoe and on Ben Nevis for the first time? It sort of made this point).
Ice climbing is so much craft, at least to start off with. If someone can climb VS or 6a, let's say, they are plenty strong enough to hang onto a modern ice tool long enough to get up a 4 mtr vert section in the middle of a 15 mtr icefall (I show this, for example!), but if they've never done it before they are almost certainly going to completely flame out swinging their tools poorly, get shit sticks and not getting their legs to do enough.
I've never climbed on an indoor wall, but as long as an instructor knows what they are talking about, I could imagine being coached could help quite a lot.
Post edited at 15:07