In an effort to show some sympathy, I took her through my set of sequences to strengthen her back and core muscles. And boy, did I hear her moan. She was barely raising her head a fraction from the floor.
So then I tried to check her breathing. Zilch. Whenever I said 'Breathe in' she duly pulled in her stomach. And when I said 'Breathe out' she puffed out her belly. I think the problem is the words 'in' and 'out' make her behave completely the opposite of what she should be doing.
I think it should be compulsory for all teenagers to re-learn how to breathe properly.