Question: What sport do both Ralf Zumdick and VfL Bochum have in common?

Context paragraphs:
Ruhrstadion: Ruhrstadion, known as Vonovia Ruhrstadion due to a sponsorship deal, is a football stadium in Bochum, Germany.  It is the home ground for the VfL Bochum and has a capacity of 29,299.  It was known as rewirpowerSTADION ] (or, rarely, ] ) from 2006–16, also for sponsorship reasons.

1975–76 VfL Bochum season: The 1975–76 VfL Bochum season was the 38th season in club history.

2013–14 VfL Bochum season: The 2013–14 VfL Bochum season is the 76th season in club history.

Ralf Zumdick: Ralf Zumdick (born 10 May 1958) is a former German football goalkeeper.  After his career (21 2.  Bundesliga, 282 Bundesliga games; one goal) Zumdick was assistant coach at VfL Bochum from 1995 till 1999.  Zumdick is often cited as the player who pioneered the practice of the penalty-taking-goalkeeper when he scored against Andreas Köpke in 1988.  He is currently manager Thomas Doll's assistant coach at Ferencváros.

VfL Bochum II: VfL Bochum II (also known as VfL Bochum Amateure or VfL Bochum U-23) was the reserve team of German football club VfL Bochum.

1974–75 VfL Bochum season: The 1974–75 VfL Bochum season was the 37th season in club history.

VfL Bochum: Verein für Leibesübungen Bochum 1848 Fußballgemeinschaft, commonly referred to as simply VfL Bochum ] , is a German association football club based in the city of Bochum, North Rhine-Westphalia.

2009–10 VfL Bochum season: The 2009–10 VfL Bochum season was the 72nd season in club history.

1973–74 VfL Bochum season: The 1973–74 VfL Bochum season was the 36th season in club history.

Charles Atsina: Charles Buaku Atsina Junior He is a Ghanaian and Italian naturalized professional footballer resident in London and currently playing for Vllanzia in the Albanian Superliga. Born on the 24th March 1989, grew up in Italy where he started his Football academy coached by Vittorio Zerpelloni http://www.calciatori.com/calciatore/zerpelloni-vittorio who was also a professional player from the Italian serie A&B. Atsina speaks four European languages Italian,English,Spanish and German In 2012, he joined AD Alcorcon The Liga Adelante, The 2nd Division club in Madrid With a Deal of €250k for a 1/2year deal plus 1year option,2013 discovered by the scout of Vfl Wolfsburg Frank Benatelli ex professional player and currently coach of Csv Bochum, In 2014, he joined the German side Csv Bochum with 24 appearance 20 goals And 7 Goals in The kreispokal.  In 2015, he joined Tus Ennepetal with 22 appearance 5goals in the league and 5goals just in the 1st game of kreispokal https://www.derwesten.de/sport/lokalsport/ennepetal-gevelsberg-schwelm/widerstand-haelt-nur-eine-stunde-id9963722.html.  Currently playing for the Finnish club Käpylän Pallo based in Helsinki.  A very well known player in Bochum (Germany)for his record goals

Supporting paragraphs: Ralf Zumdick VfL Bochum
Answer: football