I remember being in 5th grade and going to gym class, dreading it. I was a skinny kid, tall like a reed, and born with what my Uncle used to joke a "sunken treasure chest." I used to change for gym and be so embarrassed because my chest looked sunken in rather than a chest like Tarzan with big pecs. The medical terminology for the condition is Pectus excavatum and it's more common than people might think—1 in 1,000 births.