Varela, M. T., Duarte, C., Salazar, I. C., Lema, L. F. and Tamayo, J. A. (2011) “Physical activity and sedentary behavior in college youth from Colombian cities: practices, motivations, and resources”, Colombia Medica, 42(3), pp. 269–277. doi: 10.25100/cm.v42i3.872.