There are three Naihanchi kata. These kata are performed in a straight line side to side using techniques that are useful for close in fighting. The Naihanchi kata were the favorite of Choki Motobu and were often taught to beginning karateka before the Pinan kata were created.
These videos are part of an advanced study project I took on as a Yondan and Renshi to video document the full set of 18 Matsubayashi Ryu kata.
These kata are based on the versions described in Shoshin Nagamine’s book: