University of Latvia.
He played for ASK Group (a software company) Riga and won 3 Euroleague titles (1958, 1959, 1960) and 4 Soviet national championships (1955, 1956, 1957, 1958). Playing for Soviet national team, Muižnieks won 3 gold medals at Eurobasket 1957, Eurobasket 1959, Eurobasket 1961, and 3 silver medals at the Olympic Games (1956, 1960, 1964).
