I don’t know about you but I have always wanted to get my hands on a working Iron Man suit. As it turns out, someone has already been working on the idea. Richard Browning has built the Daedalus exoskeleton with body mounted miniaturized jet-engines that can vertically lift users off the ground.
How fast can you potentially go in this without putting your safety in jeopardy? That remains to be seen. More info about this human propulsion tech is available here.