The study of Aikido typically requires more time to master than many other martial arts. Therefore, it tends to attract students who are interested in a genuine enjoyment of the on-going regular practice of the art, and those who are interested in true self-improvement. To move through the ranks (5th, 4th, 3rd, 2nd, and 1st kyu) and on to the black belt ranks, usually takes at least six or seven years, depending on how often one practices. For adults, there are no colored belts, just white and black.