Repetition is not like repetition. To improve skills and creativity in problem solving in sports like tennis, we need more than hitting 10 000 hours the same ball in the same context. Differential learning gives us an idea how to make motor learning more effectiv and more fun! These are some examples how we can vary in coaching without the traditional imagination of repetition. Do it differential! (slides from my presentation „power of differences“ at the „It`s my game II“ conference.