Progress. That's what it's all about. Improvement, feeling like you are actually getting somewhere after being at a standstill for what seems like an eternity.
This is part of what I love about climbing - the challenge isn't against anyone or anything else, it's all about you - what you can do, what your mind can pull you through and how far your body can follow.
Last night I went to the wall. They had finally put up some new boulder problems so despite feeling decidedly unmotivated and possibly even a touch depressed at first (that's another story), I did actually have a remarkably good session.
I have always liked the onsight style of climbing, and although it doesn't really apply to bouldering all that much (and certainly not to indoor bouldering), by definition that was what I was doing last night. And I was cruising. Onsighting/flashing V3s! Doing V4s on the second try! This is definitely progress.
I feel stronger and more technically capable than ever before despite being physically exhausted. I'm climbing better than ever before, even when my body is fatigued and weak.
I think I have broken through the plateau!