right - (please correct me if i'm wrong...) interval training in climbing is aimed at endurance mainly but can be geared to power-endurance. As this is a bouldering site then I'll share my interval training for bouldering ideas...
Find four circuits of varying difficulty, the easiest you should be able to lap, the hardest you should be maxed out but able to finish when fresh. Do a lap of the easy one, rest a couple of minutes, do another lap, rest again, lap the next one, rest, etc... you get the picture...
Interval training enables the athlete to improve the work load by interspersing heavy bouts of hard climbing with recovery periods of shorter length than you would rest were you trying to redpoint summat.
Please read the guru:-
http://www.planetfear.com/climbing/training/neilgresham/ng_intervals.htmIt all depends for what you are aiming - this is not a good strategy for power!