In my opinion, this is probably one of the toughest routines you could do. Not only are you working on your upper body by pushing your body into a handstand position, but you’re working on your core as well, especially when you do this routine with both feet straight together. It took me several months of practice to get this move down clean although even then I only manged to get 2.5 reps of it. Even if you have the core strength, not many people have the upper body strength or vice versa.
I have new respect for gymnasts!