here in the u.s. mystery solved. thank you, elena, for the big breaking news this morning. i stand corrected. >> i believe also pinwheels. or something like that. three names depending on the region. >> there it is. >> ding-dongs, king dons or big wheels. depending upon the region. >> there we go. don't google "king dong." public service announcement. >> no g -- king don. d-o-n. moving on. >> we can all breathe. move on. closure. a new unhealthy trend among some young men and even young women. exercising to extremes and using supplements to help them get ripped. >> a new study shows it is more prevalent than anyone expected least of all parents. dan harris has more. >> reporter: the videos are burning up the internet. teenage boys transforming their body. going from skinny to ripped. a graphic illustration of what the study says is a surprisingly prevalent trend. the study authors warning the use of muscle enhancing behaviors is substantially higher than has been previously reported and is cause for concern. with 90% of boys in middle and high school saying they