Level 6 is easier, as the resistance band aids the body's further development of the tuck, rely little on the band to eventually lift your feet off the ground, start with a tight band and gradually progress to a lighter band. While level 8 focuses on posterior pelvic tilt ( contracting the abs and gluts shoulders protracted) it's harder than it looks, this should inhance your form capabilities. Hope this is useful dude 💪💪
Trust me if you can’t tuck planche trying this many different progressions is a waste of time, good to know but to anyone tryna follow this unless you have 0 strength then you will get this with lean presses, banded holds and scap push ups