He appeared as a gladiator in the music video of Bon Jovi's "Say It Isn't So" in 2000.
From 1966 to 1974 he was a member of the swimming club of Recklinghausen.
He placed third in the first bodybuilding competition he participated in.
In September 2006 he and the Minister for Family Affairs started "Starke Typen" (roughly translated "Potent Guys") in Germany. Its goal is to give the youth from social hotspots a positive attitude and moral support. He traveled through several cities and talked to the kids in the social hotspots and gave them tips how to improve their lifes.
He won the world championship of the "International Federation of Bodybuilders" in 1986 in Tokyo.
He has two daughters: Laura and Jacqueline
He is the first German who got the leading role on an U.S. TV show (Conan (1997)).
In 2003 he appeared in the music video of the Scooter song "Maria (I Like it loud)".
Ralf has worked with "E Nomine", a German techno group, on some of their albums.