While I don't teach Martial Arts (only a beginner at those), I do teach Springboard diving which very much involves a lot of repetition of the basics. Every dive we do consists of 2 basic elements: The jump at the beginning, and the entry into the water at the end of the dive. So we practice the jumps first, over and over again until you can do them without thinking. Then you practice the entry into the water by literally just falling in head-first. Again this is practiced over and over until it is muscle memory. Then you put the 2 elements together to create your basic forward dive. After that, you slowly build on it by adding somersaults and by doing the dives in different directions. But no matter what kind of dive you do, it will always have a jump at the beginning and an entry into the water. This can be very boring for new students when you spend 30 minutes each week just doing basic jumps, but they are necessary in order to be able to do the dives properly. I imagine a lot of Martial Arts follow the same principle.