The RollerSizeR does this because it aligns the body in the exercise so it can be performed properly. Doing a exercise properly means less injury, faster results and lots of fun.

In the squat below, the client holds the knobs of The RollerSizeR and the trainer say, "elbows to thighs". No fixing, no adjusting, just a perfect squat to strengthen and tone thighs, butt and hips. A perfect plie squat using The RollerSizeR.
Our trainer below is doing an oblique crunch. The RollerSizeR's 'cushioned roller', cradles the neck and allows the torso to fully twist without strain on the neck that holds the heavy head. Especially our trainer, (Ego weighs a lot!). The heavy head has a place to rest while our trainer gets a true target on the obliques. Let's just say, good bye love handles.