How to grow our height in one week?

Look, the short answer is you can't permanently add height in one week. Your genetics pretty much set your maximum height. However, you can definitely look taller by improving your posture. For the next seven days, focus on stretching your back, chest, and hamstrings every morning. Do some core exercises like planks to help you stand up straight. Slouching can easily hide a couple of centimetres of your real height. If you're still in your teens, your best bet for long-term growth is always good nutrition and plenty of sleep.