While I am far from a racer, I do exert maximum effort on my rides, especially on the days when I do hills. On a few occasions, about once every three times or so, on the way back, my legs are so sluggish I literally have to get off and walk the last climb. It usually takes about 10 minutes of walking, and when I re-mount near the top or at the top, I am fine for the rest of the way home, about 5 miles.
This is, apparently, due to a build up of lactic acid. Is there a way to hasten a return to normal or to lessen the build up? Is it just more training on the hills?