Alice Robinson from England tested several popular techniques and managed to become 1.5 cm taller in a week thanks to stretching her spinal column and increasing the intervertebral disk height by 1-2 mm. Correct posture will add another inch to your height.You actually become taller even while you’re asleep. 10 minutes of lying on your back adds 5 mm of height. This happens due to the shrinking of the spine during the day and its returning to shape when you lie down. You can make this last by doing certain exercises, although remember that an adult whose growth zones have closed (>25 years old) won’t get any astonishing results.