I honestly have no clue what's going on in these youtube videos as everything is completely in Japanese, but from what I can take away from it these are some endurance tickling tests or challenges of some sort. I'll post a couple links here, but there are a few others in the related videos tab and maybe on the channel if anyone wants to sift through it as they seem to do a lot of different trending challenge videos. Remove space for links.
https://www.youtube.com/ watch?v=Pfwei0i1Vos F/F Feet
https://www.youtube.com/ watch?v=JP--SaGErDo F/F Underarms
https://www.youtube.com/ watch?v=JiUZU6J9Y48 F/F All over
https://www.youtube.com/ watch?v=R4ynfEkIvBQ F/F Feet
https://www.youtube.com/ watch?v=nbO9nI-BY5I F/F All over
https://www.youtube.com/ watch?v=Pfwei0i1Vos F/F Feet
https://www.youtube.com/ watch?v=JP--SaGErDo F/F Underarms
https://www.youtube.com/ watch?v=JiUZU6J9Y48 F/F All over
https://www.youtube.com/ watch?v=R4ynfEkIvBQ F/F Feet
https://www.youtube.com/ watch?v=nbO9nI-BY5I F/F All over
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