Located in Libertyville, Foss Swim School is a talented and energetic group of professional swimming instructors dedicated to executing the world's best learn-to-swim program for your family. Since 1993, FOSS has redefined the ""swim lesson"" experience for thousands of swimmers by providing a unique, creative, animated, challenging, and remarkably ""FOSS"" style of teaching. Try it. Learn it! Love it!! Swimmers Guaranteed.