Freestyle walking is the "sport" where the "players" walk around and do "leaps" and clever "jumps" in the air. They call it a form of rollerblading or skateboarding with the "skates" or "boards." We call it "stupid." This isn't even Parkour where guys are jumping off balconies and across roofs. According to the wiki page: "Some see a correlation between parkour and freestyle walking. Although the two contain seemingly similar movements, the art forms are driven by different motives. Parkour focuses on efficiency in movement; freestyle walking focuses on spontaneity and glory in movement." So the next time you're walking down the street, just jump into the air and voila, you're a freestyle walker!
It's like running, but slower.