yeah, they're playing and chasing all over but they go under the side table where they barely fit with high speed and their backs grind on the bottom of the tables, if i was the one doing that i would have a scraped back, are they physically tough?
If they are just playing, then they wouldn't do something over and over that hurts them (opposed to if they were being chased by a predator). Cats are smart. If something hurts them, they're not going to keep doing it. My boys do this all the time--diving under dressers, in between the couch and the wall where you wouldn't think they'd fit!!--but they are fine. Sometimes it may SOUND like they are scraping, but their fur helps protect them.
Unless you start seeing signs of a wound, I'd say No Worries!
Ditto on the no worries. HAHAHA, though, on hearing about the rambunctious bengals! Looking forward to hearing more antics. You do want to look around and cat-proof the place to prevent any accidents. Cover sharp corners with corner guards.
Sometimes when my cats are playing, they thud or whump so loud I get worried about injuries, but they seem just fine. My heart still stops for a sec when I see one of them sailing thru the air when they're doing a mad dash around the place.