[mpnordland]

Interesting, but for me useless. I use vim each and every day, and I think I have a good claim to some muscle memory. But this excercise asks you to press keys with no context. I can navigate with hjkl just fine, but actually struggled to remember which key to press. But in vim I'm fine. Separating the shortcuts from the editor is not a good thing.

[userbinator]

Exactly, that is what muscle memory is about --- it's an unconscious thing. I find the same is true for typing too - if I actually try to think about where the keys are, I slow down dramatically - and I have absolutely no problem typing at full speed a word I've never seen before, although I don't know what keys I pressed or how to spell it after I did it.

[sejje]

I'm a proficient VIM user of approximately five years, and I was utterly useless on this training program.

I don't think that training on it would be useful at all.