The left knee collapses if you walk on it too long, the lower back is a mess if you don't do yoga at least every other day, one of the discs in the spine pops out occasionally and you have to pop it back in (I'd show them the method for doing this), and there's sciatica in the right hip. You'll be able to tell it's really dehydrated when some of the skin over the left eye becomes kind of taut. It develops disturbing heart palpitations if you don't feed it correctly. It will be thin no matter how much weight you lift or what you eat, which is a double-edged sword - you will be skinny, but people will constantly feel the need to point out how thin you are all the time. Other than that, it's a pretty reliable body.