Race car driving?

A frequent recurring character, driving car number nine (the "Shooting Star"), is the enigmatic Racer X (覆面レーサー Fukumen (Masked) Racer), a mysterious soldier of fortune whose secret identity is that of Rex Racer (Ken'ichi Mifune), Speed's older brother, who years earlier had a falling out with the family and exiled himself. Rex left home estranged from his family and assumed the Racer X identity to pursue his racing career after arguing with Pops about it. Originally Racer X wore an elbow brace for a supposed injury. Later in the series, during a violent encounter with bad guys, the unrestricted use of his "injured" arm made him realize that the arm was healed. He stayed in the background looking out for Speed Racer, often rescuing or assisting him. Racer X always left the scene unnoticed, receding into his secret life.