What changes would you make in a redesign of the human body?

PLEASE NOTE: This is being asked in GENERAL. I’m interested in thoughtful, factual responses, not jokes.

We are on the verge of a genetic Singularity, and have been since HUGO was completed and lit the fuse. Now CRISPR has gotten us to the point of boutique genetic engineering, and it’s soon going to be possible to start redefining what it means to be human.

If it was up to you, what physical changes would you make to the human body? Extra limbs? Photosynthetic skin? Hollow bones and wings? Eyes which see into the x-ray spectrum? Gills? Supernumerary organs for back-up? Muscular hypertrophy? Other?

You should also indicate whether you think these changes should breed true. It’s fine to add six arms, a tail, super-strength, and fast-twitch muscles when one lives in a technological civilization with access to surplus food, but what happens if and when that civilization collapses and suddenly humans require 15,000 calories a day to scrape by during a new ice age?

These are the kinds of questions I’d like to see people considering.