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.
He Pingping, the world's smallest man at 74.61 cm tall, poses with Svetlana Pankratova, who is the woman with the longest legs in the world at 132 cm, as they launch the 2009 edition of the Guinness World Book of Records at Trafalgar Square on September 16, 2008 in London, England. (Photo by Fred Duval/FilmMagic).