The subjects included in the experimental group will carry out an intervention using plyometric exercises and isometric exercises with elastic band for the quadriceps muscle. Each session will last 15 minutes, taking place for 3 days a week, in a period of 8 weeks. The intervention will be made at the beginning of the training session.

The subjects included in the experimental group will carry out an intervention of isometric exercises with elastic bands for the quadriceps muscle. Each session will last 8 minutes, taking place for 3 days a week, in a period of 8 weeks. The intervention will be made at the beginning of the training session.

The Drom Jump technique with the legs flexed will be performed with the patient standing in front of a bench 30 cm high by 100 cm wide. The physiotherapist will be placed lateral to the athlete. The subject will be asked to jump up from the box or bench, with the hip and knees in semi-reflexion, with his hands on his hip and he will be asked for an explosive jump, followed by a jump downwards falling the floor of the same way.

The technique of lateral jumps on cones will be carried out by means of unipodal jumps, achieving a distance of 50 cm between cones. The physiotherapist will stand in front of the athlete. The subject will be asked to perform a lateral unipodal explosive jump by flexing the hip and knee.

Researchers will use the 1RM test to measure maximum strength by trial and error, taking into account the nRM (number of repetitions) performing a repetition for each series without exceeding 15 maximum repetitions, or even be effective in less than 10 maximum repetitions increasing the load in each series progressively, depending on the abilities of the athletes. We will perform 5 minutes of light activities, then one minute of stretching, heating of eight repetitions to 50% of 1RM, followed by three repetitions at 70% of 1RM. After 5 minutes of the interval, the 1RM test will be performed. The weight will increase progressively 5kg, three to five times until the maximum RM. The assessment of quadriceps muscle strength will be assessed through the full squat exercise. The unit of measurement is the Kg, indicating a greater amount of Kg, a greater maximum force in quadriceps

A metric tape will be used as a measuring instrument to assess muscle volume of quadriceps. Once the segment to be assessed is identified, we will make the assessment with the athlete in standing position. A mark will be made on the upper edge of the patella, and another one at 10 centimeters in the same plane of movement, in caudal-cranial direction. The evaluation will be carried out by measuring the entire contour on the marked lines, thus defining the different perimeters. This test has the centimeter (cm) as the unit of measurement. The higher the score, the more muscle volume the subject reflects in the valued segment.