Learning Animation - Locking question

[TessaAnnaMarie]

I'm using Avastar and Blender to make animations. 

Is there a way to lock a specific bone in place so that moving other parts of the skeleton won't change that bone's global position? 

Trying to do an animation where the Avi squats, but I can't lock the feet in place, so as I move her down the feet slide and then hard snap in the animation playback. Not 100% sure how to explain what I mean.. but if you understand.. awesome. 
Basically, I want to pin the Feet to 1 spot, and no matter what I do to the skeleton they will not move during pose mode. 

[Profaitchikenz Haiku]

The only way I know to do what you want is to set a rotation or position for each bone that isn't to be moved, it only needs to be 1 or 2 degrees of rotation but that will cause that bone to retain the position you give it.

The bone will need that rotation for each frame, so be careful you don't have inverse kinematics on and move it as a result of some other bone movement.

[Raven Huntsman]

You likely want to animate using a combination of FK (normal animation (forward kinematic)) and IK (Inverse Kinematic). Avastar provides an IK setup within it's rig that has decent results. See