Validity and reliability of IFIS:
Ortega FB, Ruiz JR, Espa�a-Romero V, Vicente-Rodr�guez G, Mart�nez-G�mez D, Manios Y, Beghin L, Molnar D, Widhalm K, Moreno LA, Sj�str�m M, Castillo MJ.
The International FItness Scale (IFIS): usefulness of self-reported fitness in youth. Int J Epidemiol. In press.
IFIS is currently available in the following languages:
Original English version of IFIS.
Flemish version of IFIS.
French version of IFIS.
German and Austrian German version of IFIS.
Greek version of IFIS.
Hungarian version of IFIS.
Italian version of IFIS.
Spanish version of IFIS.
Swedish version of IFIS.