In reply to JayPee630:
Tabata protocol in most sports is generally more effective at anaerobic capacity rather than aerobic (although it does benefit this too). With climbing it's the same, just using forearm muscles, which is where climbing differs from other sports (the fatigue generated is more local, in the forearms rather than the whole body system)
The key is getting the intensity right, (as in other tabata sports training, rather than just doing random 20/10 intervals)
When you do it's very effective indeed!