This is so good for strengthening for yoga poses. Unfortunately these kind of strengtheners don't work with yoga belts and so have I have to talk my students into one more piece (set) of props. Sometimes they choose not to and then are left to do it with "only" awareness" which is the yoga way. We always work to put intelligence in our hips but bands help so much! Even the Iyengars started using props like therabands and large exercise balls before they passed away. 

Thanks Tom. That was great.

Tom, I wrote a comment here and it is not here now. Did I make a mistake or is it somewhere else? Thanks, Linda

Thanks.  I run into so many people with extra wide infrasternal angle. I would love for you to address any strengthening  to lessen that angle. It is so easy to compensate there by peeling that open in twists and use that mobility rather than true thoracic rotation. Thoracic rotation stretch is a perfect example.