Variously called power stilts, velocity stilts, PowerBocks, PoweriZers (PowerStriders), Pro Jumps, 7 League Boots or Powerskips. (As marketed by different manufacturers.)
Click PLAY or watch it on YouTube.
That’s Mikael and Mattias Lindström from Sweden in the video.
They were originally patented by Alexander Böck, from Germany … as Powerskips. The name of “PowerBocks” is derived from Mr. Böck’s name.
Powerbocking – Wikipedia
Thanks Michael Sanders.
Gymnastics Coaching.com 