I'm always interested in working out and staying in shape. I saw found this:
http://bodybuildingpro.com/bodytypeinformation.html
and this
http://www.innerexplorations.com/psytext/3.htm
It's fairly interesting. Like all typing systems it's notoriously flawed, but still a good system. You are probably a mixture of types. Personally, I think I'm a mixture of ectomorph and mesomorph. I am naturally skinny, but I have broad shoulders and an athletic body. I can gain muscle fairly easy if I have a good routine. I neight gain or lose weight very efficiently. Come to think of it. I might be more of a mesomorph. You never realy know during puberty. I shot right up in height so I probably didn't have time to develope anything else. Whatever, it's all a mystery.
By knowing how you're body works, you better manage you health. Also, I found the list of celebrities for each body type to be interesting.