Over this side of the pond we’ve had some CG adverts showing people forming human bridges,pyramids and other things slightly reminiscent of the formations that Army Ants use when laying up at night.
Obviously if humans attempted to emulate ants they would be severely constricted by their larger size,mass and weight visa v their strength.
But what could people in reality achieve in that direction if you had any choice of varietys of physique as in thin wiry people,massive muscular types,dwarves whatever.
We did plenty of those at home. 4 tiers was trivial and 5 was common. 6 was the stuff of dreams and bruises. This all from just your local kids at the beach, nothing organized or practiced or trained for.
It would always be in the water, with the bottom tier in the water at around chest level. The bottom tier would be 4-8 people around and up from that in often smaller tiers. We were very proud of our Colosseum with four tiers of 8.
It took all shapes, sizes and body types. As I grew older, I went all the way from being the little kid at the top to the solid guy at the bottom. It is always fun no matter where you are.
We never had any injury worse than a chipped tooth (and a badly bitten knee).
Bridges are a completely different story. It never occurred to us to make one. It would probably take a ridiculous amount of people to counterweight any significant span. Also a lot of arm and hand strength. Compression is a lot easier to withstand than tension. I am sure monkeys would do a much better job of it.