How long are pools for FINA events ?
Freestyle : 50 m , 100 m , 200 m , 400 m , 800 m , 1500 m Backstroke : 50 m , 100 m , 200 m Breaststroke : 50 m , 100 m , 200 m Butterfly : 50 m , 100 m , 200 m Individual medley : 100 m ( short course only ) , 200 m , 400 m Relays : 4×50 m freestyle relay ( short course only ) , 4×100 m freestyle , 4×200 m freestyle , 4×50 m medley relay ( short course only ) , 4×100 m medley , 4×50 m mixed freestyle ( short course only ) , 4×100 m mixed freestyle , 4×50 m mixed medley ( short course only ) , 4×100 m mixed medley The long course ( LCM ) records are significantly older than the short course ( SCM ) records , and are generally viewed as more prestigious of two .