Reddit reviews Ashtanga Yoga: Advanced A & B Series DVD

this may get you started, lino miele has also written a book on the advanced series.. i would also deep dive through grimmly's blog as he taught himself the advanced series without a teacher, and figure out the materials he used. idk who you are however, but practicing beyond second or third without a teacher wouldn't be particularly advisable.

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edit: and why would you even want to do something like mulabandhasana, but mark robberds also shows much of third and some fourth