I can't easily make the difference between bios and flats. Sometimes, it's pretty obvious but not always. If the rotation is big (more than a 720), it's easy but under that, sometimes, I can't. A flat 5 looks the same to me as a bio 5 (I know they're not).
Does anyone know a way to see the difference? Cause the positions right before the take-off are pretty similar.
That thread helped me a lot but still: http://www.newschoolers.com/ns/forums/readthread/thread_id/748833/page/1/