In reply to JIMBO:
> ... it can be limited by the properties of the skin rather than strength.
Yes very good point - (And that's generally a problem with repetitive training of finger strength, unless you're intent is to somehow build skin toughness?)
Another danger of campusing on thin holds is that you're tempted to catch/latch moves on a crimp grip. The eminient Dave MacLeod specifically warns against crimping while campusing, because it's a likely a key cause of the many injuries reported from campusing.
My non-expert guess it launching a move off a crimp is not as dangerous.
My suspicion is that latching a dynamic move on a crimp has the special hazard of a failed Crimp _collapsing_ toward an Open grip -- and that it's the in-between configuration that's especially nasty on finger pulleys and tendons.
. (Whereas when latching a move with an Open grip, if it fails the fingers just slip off -- which might be nasty for skin, but less likely to injure pulleys and tendons).
An alternative to adding weight is to use fewer fingers (e.g. teams of two) on each campus move. Nice for the show-off factor, but for training I think it makes more sense to just add weight, because that's consistently measurable.
Ken