Very recently I had been to a climb where I learnt about an alternate route that requires a huge crack to be climbed. It is of about a 100-120 ft roughly.
Though I have experience in climbing open faces of walls with the aid of equipment like pegs, I have never tried much of my skills to climb through natural cracks, so before I get there, I'd like to prepare a bit in that point of view.
As far as I can see the kind of an activity it is, offset pull-ups should be good exercise to start with.
Can anybody suggest some more sort of a warm-up/exercises one should follow while beginning to prepare/practice for such a climb? Are there good online educational resources for learning specialized techniques for crack climbing?