Human height is the distance from the bottom of the feet to the top of the head in a human body, standing erect.
When populations share genetic background and environmental factors, average height is frequently characteristic within the group. Exceptional height variation (around 20% deviation from average) within such a population is sometimes due to gigantism or dwarfism, which are medical conditions caused by specific genes or endocrine abnormalities.
John Brzenk (born July 15, 1964) is a professional armwrestler from the United States. He competes in the Professional Armwrestling League, and as of 2009 is the number-one armwrestler in the world. John was named by the Guinness Book of World Records as the "Greatest Armwrestler of All Time".
Fiodar Machnoŭ (Feodor Machnow, Фёдар Махноў, Фёдор Махнов) was born in 1878 at the village of Kasciuki near Viciebsk (now Belarus). Though exact details concerning his birth and real height are uncertain, Machnow eventually grew to a stature of 7-ft-10 inches (2.39m) and a weight of 365 lbs.
As a young man in his twenties he toured Europe to exhibit his great height. After having spent time in Berlin he visited London in 1905 where he joined the Hippodrome accompanied by his wife and young child. He then toured the United States in 1906 where he met President Roosevelt. Throughout his tour his promoters exaggerated his height, and he is usually accredited with a stature of 9-feet-3 inches (2.82m) and billed as "The Russian Giant." On the obelisk it is still possible to read: «Фёдор Андреевич Махнов. Родился 6 июня 1878 года. Умер 28 августа 1912 года. Самый высокий человек в мире. Ростом был 3 аршина 9 вершков» ("Feodor Machnow. Born June 6, 1878. Died August 28, 1912. Tallest man in the world. He was 254 centimetres tall"). This index was taken from a 16-year old Feodor contract. But after 16 years of Feodor Machnow continued to grow, and added 31 cm, reaching 282 cm. Giant's wife, Efrosinja wanted to correct the incorrect figure on the monument, but was prevented from doing so because of the beginning of the First World War and then the Revolution. Unfortunately Machnow's wife could not verify this version. This exaggeration may have been because he wore a huge Cossack fur hat, and tall boots which added a foot to his height. Although, if this was accurate, he would have been taller than Robert Wadlow.