N2i;
Polytechnic Institute of Maia Research Centre;
Maia 4475-690;
Portugal;
CIPER;
Interdisciplinary Centre for the Study of Human Performance;
Cruz Quebrada 1499-002;
Portugal;
Abertay University;
School of Social and Health Sciences;
Dundee DD11HG;
UK;
Polytechnic Institute of Santarem;
Sport Sciences School of Rio Maior;
Santarem 2001-904;
Portugal;
CIEQV—Life Quality Research Center;
Santarem 2001-904;
Portugal;
Confirmatory factor analysis; Construct validity; Enjoyment; Exploratory factor analysis; Fitness; Measurement invariance; Self-determination theory;