The article teases by opening with a casual mention of "high speed running boots" but I'm having a devil of a time finding any info about that.

I've thought about this a bit myself. About 15 years ago my unpowered prototype allowed me to speed walk about as fast as I could sprint. Only problem was my ankles kept hitting each other... Very painful.

Sounds like a very inventive and interesting guy rather than a one trick pony. Good luck!