[1] IL i BUL has sections for track and field athletics and skiing, and has previously been active in orienteering, football, and handball.
Well known athletes are the long-distance runners Ingrid Kristiansen[2] (World Champion in 1987), Thor Helland, Knut Brustad, Øyvind Dahl and Moroccan citizens Khalid Skah (Olympic Champion in 1992) and Abderrahim Goumri.
In 1965 BUL co-formed Bislett-alliansen, together with two other sports clubs, IK Tjalve and SK Vidar, and since 1966 this group has organized the annual Bislett Games, an IAAF event.
Among the skiers who have competed for IL i BUL are cross-country skiers Johan Grøttumsbråten[4] and Odd Martinsen, both Olympic champions and world champions; Bjarne Iversen;[5] Henry Hermansen;[6] and Heidi Weng;[7] and ski jumper Sigurd Solid.
The women's team played in the highest league in Norway as late as in 1991.