well i agree with pretty much everyone. katas/forms/patterns/hyungs are essential to learning most martial arts, particularly traditional ones. one main thing they do is build muscle memory of these odd movements you would usually not do everyday in passing. secondly, forms aren't just movements you just do because your instructor said so, there is a term some japanese and chinese arts use called bunkai, and it is how the form you're doing applies to an actual fight. breaking down the bunkai,(how many people you're fighting, why you hit someone in a specific way, etc.) is the most mentally taxing thing, but when you're done, you know it and you know who you were fighting, why, and what movements you'd use. so when you actually get into a fight, if the time unfortunately comes, you know exactly what to do. and don't worry guys all art froms and disciplines have this, korean, japanese, chinese etc. atleast all the traditional ones will. in tang soo, K.Chuilli