In High School, saw a guy do basically the same thing in gym class. But he straddled the spring. When he came down the spring opened up from the weight and as he went back up the spring closed on one of his testicles. We had to gang up and pull down on the mat to get the spring to open to get him out.
ouch
Yeah, personally I'd have chosen a less rocky place to do that at but that's just me.
i watched peeps do that in spain,they were skirting with their lives.entertainin though.