What to listen for: “If I cannot, in five repetitions, isolate a variable down and get it where I want it, I do need to stop. That doesn't mean the next time we'll be successful. What that tells me is, don't do the same thing again and again and again. And there's been a lot of variation. Isolate that variable. It looks good now. Put it back in a chain, it doesn't look good. What have I done wrong?” In part one of this two-part discussion, Robin Greubel and Crystal Wing sit down with spec...