And I'd like to get rid of my blue-balls...
This is tricky. I get the feeling we are supposed to come up with something that wouldn't really be possible without extreme measures. Height qualifies as that because stretching is very risky business, but I am quite happy at 6 feet (that's above ground, thankyouverymuch). Saying "my nose" would be highly unimpressive as rhinoplasty takes all of 30 minutes today. Hmmm.
I guess I'd like to have slightly more arched feet. I am a bit flat footed and sometimes it really hurts when jumping or walking briskly.