The Matson Evaluation of Social Skills in Youngsters (MESSY), in its Spanish version, was used to assess social skills in students. The questionnaire includes a four-step response format: never, sometimes, often, and always. It evaluates five factors: appropriate social skills (24 items) such as making friends and emotional expressiveness (e.g., "I look at people when I talk to them"); inappropriate assertiveness (16 items) addressing aggressive behaviors (e.g., "I take things that are not mine without permission"); impulsivity (5 items) such as getting easily angry (e.g., "I interrupt others when they are speaking"); overconfidence (6 items) involving self-overvaluation (e.g., "I like to brag to others about the things I have"); and jealousy/loneliness (4 items) exploring feelings of isolation (e.g., "I feel lonely"). Only the student version of MESSY was used in this study.

The D2 test, in its Spanish version, assesses selective attention and concentration in the school context. The participant's task is to carefully check, starting from left to right, what is written on each line and must mark all the letters that have two small lines (two lower, two upper, or one lower and one upper) with a "d". These elements are considered relevant. The other combinations (the "d" and the "p", with and without lines) are known as irrelevant, and should not be marked. The participant has 20 s for each line. This test has demonstrated excellent reliability, with ranges between 0.90 and 0.97 for both Cronbach's α and the test-retest, and has also shown convergent and divergent validity.

The Creative Intelligence Test (CREA) is used to assess creative intelligence by cognitively assessing creativity on an individual basis by reproducing question indicators within a theoretical context of research and problem solving. The procedure consists of showing a photograph to the child and asking him to fill in the blank spaces at the top of the copy with the data that appear. The task is based on writing, briefly, as many pre-questions as possible about what it shows. The CREA test has been found to meet the standards of reliability and validity required for a psychological test (Cronbach's α = 0.875).

To assess memory, a 1-minute ad hoc test was used, based on the original ideas of the memory test included in the Spanish adaptation of the Reynolds Intelligence Scale [RIAS]. A poster of 15 randomly selected Spanish playing cards was projected for 20 seconds on a 3 x 2 meter screen. Immediately afterward, participants had 40 seconds to record on a standardized sheet the greatest number of cards they could remember. The total number of correct answers was counted (range 0-15). Before the test, it was verified that all participants knew the structure and content of the 40 cards in the Spanish deck.

This will be determined using the 20-meter Course Navette Test, an incremental test in which participants must run from end to end over a distance of 20 meters, following an audible signal and increasing their speed in 0.5 km/h intervals every minute. The test will begin at a speed of 8.5 km/h and will end when the participant fails to maintain the pace on two consecutive attempts or stops. In each case, the number of periods passed will be recorded at the end of the test. This test will be administered only once at the end of the data collection session.

The 4x10-meter shuttle test will be used, in which students must cover the distance four times at maximum speed.

This will be measured through three tests: i) upper body strength will be assessed using a handheld dynamometer, in which a handheld dynamometer will be used for each limb; ii) lower body strength will be analyzed using the horizontal jump test without momentum; and iii) a muscular endurance test will also be performed with a 30-second sit-up test.

This test will be assessed using the Sit-and-Reach test. The test will be performed using a special 33 cm box with a sliding ruler attached to the top. Participants will sit on the floor with their knees extended, shoulder-width apart, and their feet in contact with the bottom of the box. They will be asked to bend their torso and extend their arms forward as far as possible, holding the final position for at least two seconds. The test will be performed twice, and the best result in centimeters will be recorded.