I've wondered about the advantage of climbing out of the saddle. It seems to depend on the rider leg strength (not power) and gearing. On many rides I've noticed that when we hit a hill even at a moderate pace, the lighter guys get out of the saddle while I stay seated. They aren't necessarily going any faster up the hill though. They also typically have something like a 39x23 low gear vs. my 39x28. I only get out of the saddle for relatively short climbs at speed - say I'm doing 22-mph over relatively flat ground and hit a short hill I may stand and power over it while only dropping to 18-mph then sit back down and keep going. If it's more than a short hill I won't be able to maintain that power output without going anaerobic so I just sit down and drop into a lower gear. I have a great deal of muscle strength and I'm a good sprinter but my muscle endurance sucks. I haven't seen any recommendations to train out of the saddle. The climbing routines I've seen usually say to pick a hill and a gear where you can do around 50-rpm for 20-minutes. Rinse and repeat several times.