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.
At just under 25 inches tall, Jyoti Amge of Nagpur, India, is the world's shortest woman. She's a college-bound student, with dreams of making it as an actress. Still, she weighs just 12 pounds -- only nine pounds more than she did at birth.