/ rainbowing at the wall, better prep for outdoors
I think you'd be doing very well to determine which holds were in and which were out, as you climbed. Better to work out from the deck what ones you can use. Personally, I think it'd be a poorer training option than just doing a single-coloured route, pre-graded at your target F6b.
Yes, you could do it the way you suggest, but I don't think you'd get much benefit from it, if any.
Just using features for feet would be better
Unless you're very disciplined I think you'll find yourself either making lots of very small moves with generally good, perfectly placed footholds or bouncing between jugs like a gibbon. Neither of which are good training for trad (climb an easier than normal route slowly and statically, test holds and shapes before you commit to them, pause frequently and reverse a few moves periodically). Or sport (climb the set route, it's as close to a chalked sport route as you'll get).
That said, if you want to try it, go for it.
+1 - perhaps the most unrealistic feature of climbing walls is sticky-out footholds
At the Westway the newest wall is very realistically featured and has good grip... there are at least three climbs that can be done 'features only' for both hands and feet. This includes normal features, finger cracks and my favorite; an off-width crack :)
GULF; maybe there is a wall within a doable distance from you that has something similar?
Thanks for the replies, they have given me food for thought.
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