It's helped my hillclimbing and overall cycling hugely (I'm not sure it isn't "the thing" that kicked me over from 12-mph, 70 mi/wk to much stronger) to have done a single indoor training ride with video, where they explained "go round and round, not up and down." Couldn't help but notice that when I remembered that, suddenly other riders were getting closer instead of receding into the distance on our little upgrades.