/ training for climbing on loose rock
Holds stuck on with blu tack would be more like it
No. Climbing on loose rock just takes care/experience, you can't practice it. Also, there's plenty of stuff on the North Devon coast that isn't loose.
I think pushing rather than pulling is the best advice for climbing loose rock. Even if you're very static, if you're pulling out on dodgy holds, it may end in tears/death.
No. Climbing wall holds spin when they are loose - which can hurt your wrists. Loose rock just comes off (or if you're lucky moves a bit then stops!). Like Jon says, pushing rather than pulling on the rock works well. Just be really smooth and delicate. Be sure to tap/ whack holds to see if they sound loose/ move. For low angled stuff, it may be good training to practice climbing with a tennis ball in each hand (a game I've heard of but never tried).
Much of it is really solid. Some of it is so solid and featureless that you'll only need really small wires.
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