Keeping effort at the right level.
I don’t mention it in the podcast, but the title is a reference to a piece of teaching the Buddha gave to a monk who used to be a musician before he was ordained. The monk was trying too hard in his practice, and eventually exhausted himself and became discouraged. The Buddha knew of his musical interest, and reminded him that tuning a string too tight or too slack will not produce the desired result. The monk understood, and was able to find right effort, and continued his training successfully.