. Since two lessons of thesecond semester coincided with holidays, in the end the
EG participants completed a total of 18 and 20 sessions of
the development and maintenance programs, respectively.
In the PE setting the intervention performed with the EG2
has been called “reinforced teaching unit” (Viciana and
Mayorga-Vega, 2015).
During each intervention session, the EG participants
performed hamstring stretches using the static technique.
Each intervention session included two 30-second
sets of four stretching exercises (except for the maintenance
sessions of the EG2 where only one stretching
exercise was included). Six different stretching exercises
were designed and alternated during the intervention
program (Figure 2). Three bipodal exercises and one
unipodal exercise were performed in each session (except
for the maintenance sessions of the EG2 that only an
exercise was performed). In all the stretching exercises,
the students were placed with their hips flexed and knees