That heel toe technique stuff is black magic to me as a simple guitar player. I play in a metal band, and our drummer does that double heel toe technique, and it just looks like it shouldn't work, but it does somehow. Even being able to do it with a single foot version is insane.

I love jazz and have nothing but respect for Jazz drummers and musicians, in general. The insane amount of knowledge and practice required to play odd time signatures and be able to improvise is not lost on me.