Anyone tried this? What are the classes like compared to Vinyasa/Vinyasa Flow? I'm interested in trying it but a bit scared... I can't do inversions yet (beyond shoulder stands) will this make it hard for me to follow the class? Is it super fast paced as the name suggests? I've only been doing yoga a few months (this time round - I did a lot of bikram a decade ago before I learned about Bikram himself and quit) so I'm not super flexible but have good form and prefer more hard-core classes. Thanks!