“If these short people follow this routine for one full month, they can increase their height two full inches and stand shoulder to shoulder with peers their age.” For sure they can but not by follow this routine for one full month or increase their height two full inches and stand shoulder to shoulder with peers their age. It should not be like that, people cannot get their height up with doing hang upside down for 10 minutes every 4 hours in one month. Spinals are not stretch by one month, there have to use longer than one month and by one month their height cannot increase two full inches and stand shoulder to shoulder with peers their age because people in same age have normal height and they can get tall with normal ways to increase, and also their height may be will faster than short people.