As a kid we were introduced to this contraption. Yes, I call it a contraption as most parents then did not let their kids go for it having heard of weird stories of damaged backs.
But Rajni not only did she dared to go for it but went far beyond and used the hoop to perform incredible moves shocking every one
As long as one knows the technique I do not suppose it is a dangerous sport as proved by Rajni. She is now known the world over and her own video talks about it
Have you ever tried the Hulla Hoop?