Chiropractors are trained under two basic schools of thought and in several different talents, such as marketing, massage technology, and spinal manipulation. They are generally required to have somewhere between three (3) years (or 90 credit hours) of collegiate schooling or a bachelor's degree before entering chiropractic schooling. Once there, they receive two (2) year to three (3) years of training in detection of vertebral subluxation, massage, marketing, musculoskeletal anatomy, and other aspects depending upon which methodologies the chiropractic school teaches and accepts as legitimate.