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j"1NF7i6ZoMDXaJ2Q5M9QFriH74ya6r6vP8u/I found this problem actually shows up in musicMðThe trick in that case is to practice at very slow speeds where you can do closer to perfect, and then work on speeding things up. Another real life variant is to break down the difficult tasks into multiple different components which you may be able actually practice perfectly. For instance, practice drumming, but at first just practice your feet. Then just your left hand, then just your right, and slowly work on combining them. The reason the question interests me enough to answer is that my first day of piano lessons my teacher explained that she can never be world class because she didn't practice properly as a kid, and now she is stuck with muscle memory habbits that are suboptimal and very difficult to retrain. Kind of fascinating.