I think Tan has looked at these before too. I remember reading the info for her. Can't remember if she went with it or not.
Interesting idea that relates to changing the type of stress that you would normally place on this muscle group.
*disclaimer; this device could seriously hurt you if not used properly*
So it places a different stress on the body that the body then adapts to.
Simple resistance training theory.
The normal stress that you under go in a game or training is 'normal' to the body - hence there is no hyper adaption response.
Meaning no improvement - those muscles will remain as they are.
Thats good if they're were you want them to be. So if you're happy - don't focus on them.
If you want improvement, as with anything - work on it.
BTW - if you work sitting down, there's certainly breathing improvements to be had by improving your posture, core strenght & regular breathing. Take a look at the way you're sitting now.
Think about how deply your breathing is right now. I bet the air isn't getting anywhere near filling up you lungs to the max
