I survived the Jungle Gym and the Monkey Bars and a couple of swings that were trainers for NASA launchpads and I was never the bravest kid in the pack. But there were casualties, anywhere from a chipped tooth to a broken collarbone. A certain moderation is probably in order here, and I’d save the punji stick pit and the hot lava for the over-twelves if it were me doing it.
I recall in grade school, one Monday some buddies and I were called into the Principal’s office.
“Boys - you’ll notice that the Merry-Go-Round is gone from the playground. All due to you boys being too rough on it and spinning other children off.”
I piped up “Well, we can just use the tall slides instead!”
(Yeah - I got detention.)
My only injury on the playground was when a bully pushed me from behind and the ground was slick ice (Minnesota winters). I landed square on my face on the frozen asphalt and blacked out and got a concussion. It happened so fast I didn’t even get my arms out to break the fall. Just WHAM - on my face (my forehead mainly as I recall).
But yeah - the Merry-go-Round was somehow more dangerous. (I don’t recall anybody getting hurt.)