Romain68 Hello Spine's Creators! What about Ik bend physic like this software? At 0:25 and visible on the tail of the creature. and Bend Physics Motor: http://www.kestrelmoon.com/creaturedocs/Animation/Bone_Motors/Bend_Physics_Motor.html Pin Rope Physics Motor: http://www.kestrelmoon.com/creaturedocs/Animation/Bone_Motors/Pin_Rope_Physics_Motor.html Those features are AWSOME... but the spine's interface, mesh deform and contraints Ik is really better. Any time... the simulation with physic is better than an long animation work. It's planned one day? : O Thanks and sorry for my bad english : O