A stretching intervention program was applied to the EGs
during the cool-down period of their PE sessions (Mayorga-Vega
et al., 2014a). Initially, the EG students performed
a four-minute stretching development program
twice a week for nine weeks (first semester). Then, after a
five-week period of detraining coinciding with the
Christmas holidays, the EG participants completed another
stretching intervention program twice a week for eleven
weeks (second semester). The EG1 students continued
performing the stretching intervention program for four
minutes while the EG2 students completed a maintenance
program for only one minute. Since two lessons of the