The chuden kata were created by Hasegawa Chikaranosuke Eishin and are considered the middle level of our MJER training.
All kata are from tatehiza exept kata #10 which is from seiza. The chuden forms #1-10 can be practiced continuously (known as Hayanuki) but, like Shoden #7 Kaishaku, this should not be done publicly as it is considered impolite.