That's the portion of the argument that heavily get debated. Regardless, I believe the barrel gets turned in every swingI don't care for the term forced... However, if you are asking if TTB is created by the hands/forums, yes, I believe it is. The core is heavily involved throughout the entire process. It has to be. But no matter how you contract or release the core, it cannot make the barrel turn without other body parts. The core is not attached to the bat.