Velocity Stilts, or powerblocks, are a brand of elastic-like, spring-loaded stilts, generally used in the act of powerblocking. Powerblocking involves jumping and running while wearing spring-loaded stilts.
Some other names used for spring-loaded stilts include "power stilts," "jumping stilts" and "spring stilts." These stilts contain a boot with a foot-plate consisting of snowboard-type bindings, a rubber foot pad and a fiberglass leaf spring. By using only a few movements of the stilts, users commonly reach heights of 3 to 5 feet from the ground and can run up to 20 mph.
Powerblocks were originally patented by a German man named Alexander Böck, as "Powerskips."