How do you define the core?

Jason, the way your company separates the core into upper and lower portions make good sense to me.

Don’t know if you have had experience with pilates, however, many of the movements involve stabilization of one portion of core (let’s say the the lower core) while the upper core performs the mobilization portion of the movement.

As an example, there is a movement called “the breaststroke” which involves back extension (upper core – mobilization) lower core provides stability.

Thanks for your post.