After I had hit ten forehands, Paul imagined himself doing the same. Then, as I put the racket into his hand, sliding it into the correct grip, he said to me, “I noticed that the first thing you did was to move your feet.” I replied with a noncommittal grunt and asked him to let his body imitate the forehand as well as it could. He dropped the ball, took a perfect backswing, swung forward, racket level, and with natural fluidity ended the swing at shoulder height, perfect for his first attempt! But wait, his feet; they hadn’t moved an inch from the perfect ready position he had assumed before taking his racket back. They were nailed to the court. I pointed to them, and Paul said, “Oh yeah, I forgot about them!” The one element of the stroke Paul had tried to remember was the one thing he didn’t do! Everything else had been absorbed and reproduced without a word being uttered or an instruction being given!
— 📖 The Inner Game of Tennis, quoted in 📰 The Mental Model Fallacy