Introduction Our bodies are amazing! They are full of mysteries and surprising facts such as this one: Did you know that you are about a centimeter taller in the morning, when you have just woken up after hours of lying down, than you are in the evening? You might never have noticed it. These interesting facts only reveal themselves when you look closely, measure and compare.
Is arm span an accurate measure of height in young and middle-age adults?
The arm span measurement is usually very close to the person's height. For example, a cm 5ft 6in person will have an arm span of about cm 66in. Age, sex, and ethnicity  have to be taken into account to best predict height from arm span. Other, possibly more accurate measuring techniques include knee length or recumbent length when possible. Because any decrease in height will cause an increase in the ratio of arm span to height, a large span to height ratio may sometimes be an indicator of a health problem that caused a vertical height loss such as postural changes due to ageing or any spinal conditions such as Degenerative Disc Disease. An above-average reach is advantageous in sports such as basketball, tennis, boxing, mixed martial arts, volleyball , discus throw , fencing, rock climbing, and swimming. For instance, boxer Sonny Liston , while cm 6 ft 1 in tall, had a reach of cm 7 ft 0 in.