 As head coach Muižnieks has led his teams to multiple championships, winning titles in domestic and international competitions.So far he has been most successful in Latvia, where he has guided his teams to six Latvian League titles (2002, 2003, 2004, 2005, 2006, 2008).First success in European club tournaments Muižnieks had with BK Ventspils, where in 2002/2003 his squad he finished third in FIBA Europe Champions Cup, where in bronze medal game they upset KK Hemofarm and their up-and-coming star Darko Milicic.