What happens next?

Various clips of various different people also wearing the bouncy stilts play and they're all running, flipping and doing various tricks while landing onto blue mats in an indoor gym. now there

Available options:
(I) are a lot of people outdoors, both men and women, and they are all running, hopping, jumping, and doing flips outdoors.
(II) 's a video of a small unison cupcake cupcake riding spin room.
(III) are several recent clips of people skateboarding, but all just arm wrestling, biking and teeth piercing.
(IV) is one lifting the other on his shoulders and braiding him together as the video continues to play.
(I)