Every September, without fail, somebody on my coaching roster sends me the same text: “The kids are back in school and I have forty minutes to myself. What do I buy?” For years I gave complicated answers. Last fall my team counted how many of our clients ended up sticking with equipment they bought in September, and one category beat everything else combined by a margin that embarrassed me. It was not a smart treadmill. It was not a fancy recovery gun. It was a pull-up bar. Not because hanging is magical, but because a bar in a doorway you…