It’s free and it’s running this weekend outside the National Theatre on South Bank. The Red Bull ‘Art of Motion’ event showcases an invigorating mix of freerunning, parkour, martial arts and gymnastics. Pre-selected competitors will take part in various heats at the venue during Saturday and Sunday afternoon (2-4.30pm): finalists will perform at the main show on Sunday evening (6-9pm). Spectators are invited to watch the lot. Jump to it.