Tai sabaki(体捌き?) is a term from Japanesemartial arts and which relates to 'whole body movement', or repositioning. It can be translated as body-management. It is a term used widely in and very important in kendo, jujutsu, aikido, judo, karate and ninjutsu. Tai sabaki is usually used to avoid an attack, such that the receiver of the attack ends up in an advantageous position and it is often wrongly referred to as evasion.
All three katas were created on the basis of the Tai sabaki movements and the circular motions of aikido. Although they do not contain complex movements, the whole kata is to be performed as a chain of movements without a specific pause.