smooth progression to stiff pose

i am using avmotion, and i know how to set it up for a stiff pose, but i wont a smooth progression to a stiff pose....

i got my animation to upload, and got it on a pose ball, but, it wont stay in the last frame pose.... like sitting down, you can see a progression of sitting down, but when he is suppose to stay sitting down, he just stands back up....

the last frame of the animation is in the sitting position to... so i dont understand why he stands up...

is there a certain number of frames the animation is suppose to have for it to stay in the last frame pose?

any help to get a smooth proggression from standing to sitting pose would be great

thank you
Rutain.

You need to set the animation to loop in the final frames when you upload

DaLeo is right. And you should read the sticky FAQ, top of this forum.
3. How do I make a pose stick/freeze or an animation repeat/loop?