A team of Iranian and British anthropologists working on human remains discovered at the 5200-year-old Burnt City have identified a male rider who they believe was a messenger in ancient times.
“Indications of riding are seen on the right leg bone of the man, who died at the age of 40 to 45. The swellings show that he had continuously worked as a professional rider since he was a teenager,” the director of the Iranian anthropological team told the Persian service of CHN on Monday.
There are blade-shaped swellings on the lower part of the leg bone, Farzad Foruzanfar added.
I'm guessing these are enlarged muscle attachments.