Rib Flares, Posterior Thorax, and FMS – Movement Debrief Episode 52

Movement Debrief Episode 52 is in the books. Below is a copy of the video for your viewing pleasure, and audio if you can’t stand looking at me.

Here is the set list:

  • What is a rib flare?
  • How can rib flares be improved?
  • What is the posterior mediastinum?
  • What is moving when we seek posterior thorax expansion?
  • What tests and interventions can be used in regards to posterior thorax expansion?
  • How far have we come from the FMS/SFMA?
  • What have we learned from the FMS/SFMA?
  • What should we be addressing now instead of the FMS/SFMA?

If you want to watch these live, add me on Facebook or Instagram.They air every Wednesday at 7pm CST.


and the audio version…

Zac Cupples iTunes                

Here were the links I mentioned:

Sign-up for the Human Matrix in Seattle, WA on September 15-16th here

Sign up for the Human Matrix in Kansas City, KS on October 27-28th here


Sign-up for the Human Matrix in Portland, OR on November 10-11 here

Here is a move for a narrow infrasternal angle

a wide infrasternal angle

An asymmetrical infrasternal angle

Mechanics of the respiratory muscles

Here is the posterior thorax expansion activity I like courtesy of Lucy Hendricks.

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Table of Contents

Rib Flares

Posterior Thorax



  1. Zac, what do you think of decline press or fly for narrow ISA? When I look at the attachments of those fibers it looks like the best one’s to go after.

    1. Hey Mark,

      It would depend on what the scaps are doing. If you are locking them down on the bench, may not be as effective. But I’m cool with either, just haven’t used them personally.

      Appreciate your contribution 🙂


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