pic #4 is just a fun general misconception imho.
We did something in our late teens much like parkour in the 70's @ J Leahy Elementary School in LI, NY late at night. It was a playground maze that I'd say covered about 2,000 sq ft. The ground we pretended was make believe lava. One long jump was about 6 feet down 15 feet out to a 8" post top w/an obstacle overhead so you had to duck and jump far. Can't say I've ever had more fun cept maybe motocross comes close.