The psoas is a deep-seated core muscle connecting the lumbar vertebrae to the femur. The psoas major is the biggest and strongest player in a group of muscles called the hip flexors: together they contract to pull the thigh and the torso toward each other.
7 photos: Photos: Tallest man meets shortest man. Chandra, meet Sultan â Chandra Bahadur Dangi, at 21Â½ inches the shortest adult ever verified by Guinness World Records, poses Thursday in London with the world's tallest man, Sultan Kosen, who stands 8 feet 3 inches tall.
The tallest woman in the history is Zeng Jinlian from China. Her height was 2.48m(8ft 1Â½ in) and she died at the age of just 17 years. The shortest living human on earth is Chandra Bahadur Dangi from Nepal and his recorded height is .546m (1ft 9 Â½ in).