Using high speed video researchers have shown how a leaping blenny, Alticus arnoldorum (a fish), can thrive on land. The blennies use a twisting motion of their tail to spring forward. Essentially these fish curl their bodies into a C-Shape and then let fire. Typically, this is used as an escape response to avoid been eaten by a predator. But these leaping blennies have adjusted their biomechanics a little so they can use it to colonise intertidal areas. Intertidal means that area between low and high tides. In other words, these fish can, and do, live a substantial part of their lives out of water.
Below is a lateral view of a leaping blenny, well, leaping.
Below is a ventral view of the leaping blenny climbing up a upright piece of plexiglass.