You’ve been surfing for two years. You’re not a beginner. But something isn’t clicking and you can’t figure out what. Your instructor watches you surf for twenty minutes before he says much. He’s filming from three different positions — beach, channel, water — capturing every angle of every wave. After the session you sit on the sand with his tablet. He pulls up your bottom turn in slow motion. You watch your back foot drift forward by six inches on every single wave — something you’ve never noticed, something you couldn’t feel, something that’s been quietly destroying your turns for two years. It takes about four seconds to identify. It takes the rest of the session to start fixing it. You leave with the video, the notes, and the specific drill. Three sessions later you’re making turns you didn’t think you were capable of.