Hi Sandy
I am wondering too how and where you feel you are collapsing in this pose. So can you tell me what you are aware of and what is ringing your alarm bells? Your body can still collapse in subtle ways even when you are in good alignment. Is it perhaps that you are recognizing these subtleties of your pose? Or do you feel you could work on your alignment but need some more tips there?
Looking forward to hearing your thoughts
Namaste
Gabrielle 🙂