With about 1800 members,[1] at present ASK is one of the biggest swimming clubs in Norway according to memberships, second only to its neighbour Bærumssvømmerne.
In the seventies and eighties, ASK was the dominating club in Norwegian swimming, with athletes like Øyvind Miller, Lasse Nagell, Knut Arne Landbøe, Fredrik Sørvig, Haakon Schram-Stokke, Kristine Moen and Karina Samuelsen.
Marstein scouted Kenneth Olsen for the top position as head coach, and presented him with a large number of talented swimmers whom he had prepared for him.
Swimmers like Ingvild Snildal, Michael Poulsen, Christian Aaserud, Siri-Eva Kristiansen, Joachim Haugen and Ola Riise are now top in their classes.
Head coaches of today are Kenneth Olsen, Michael Poulsen, Martin Skavang and Ulf Riise.