Yeah, because growth spurts don't happen all the freakin' time for teenagers.....
I really hope you're kidding.
I personally went from 215 to 255 over one summer for my senior year of wrestling. It's not the most uncommon thing in the world.
I put on 12 lbs in hs. Ended at 204. Started at 192. Came out of the boonies at 189, my all time lowest adult weight. 7 % bodyfat. Haven't seen those days forever.
Here is the point. When I started high school, I probably had a 33 inch waist and a 42 inch chest. When I finished, 32 and 46. When I got out of the service, 31 and 48. If you start off with nothing, no muscle or fat, grow one inch and really work at the right time, you could easily put on 60 +.
Oh yeah. I went from 133 lbs (wrestling 7th grade) to 192 just before football freshman year. I grew from 5'6" or so to 5'9". Worked as a bouncer that summer; loved kicking 17 year olds out for being underage and trying to fake it!