How can you get shorter in height in a week?

Answer 1

As we age, we get a little bit shorter because of the compression of the spine, so anything that pushes down on you, like heavy backpacks or even bad posture, could make you a bit shorter... but not significantly.

The only way to really become shorter quickly is to become confined to a wheelchair, or crawl, or lose part of your body in an accident... none of which I suggest.

If you want to appear shorter, you can slouch and wear the lowest shoes you can find. You could also surround yourself with tall friends so that you look short by comparison.