Patients allocated in this group will perform three sets of 15 unipodal squats with the affected limb on an inclined plane. The patient will be instructed to perform only the eccentric phase of the exercise, keeping the torso erect and flexing the knee up to 90 degrees. The return to the initial position will be performed with the unaffected leg. To increase exercise load, the patient will carry a bag with washers. This protocol will last eight weeks, with 24 face-to-face sessions.

Both groups will also receive a protocol with complementary isotonic exercises, focusing on the strengthening of gluteus maximus, gluteus medius, hamstrings and calves.

Patients allocated in this group will receive treatment based on a protocol published in a clinical practice guide, with modifications to make the protocol more pragmatic. Thus, the use of mechanotherapy devices will be replaced by free weight exercises, so that the protocol can be performed in environments that do not offer this type of machinery. This protocol is composed of four exercise stages, being the first three stages performed in the presence of the physiotherapist, and will last eight weeks with approximately 24 face-to-face sessions.

Both groups will receive a protocol with complementary isotonic exercises, focusing on the strengthening of gluteus maximus, gluteus medius, hamstrings and calves.

Exercises based on eccentric contractions of the quadriceps femoris muscle, using a 15º inclined plane. A serie of 15 repetitions of the squat will be performed, with the frequency of three times a week for eight weeks. The load of the exercises will be increased weekly.

This outcome will be evaluated by an 11-point scale ranging from 0 to 10, in which 0 represents "no pain" and 10 represents "pain as bad as it could be." The participant will classify his average pain in the last 7 days.

VISA-P questionnaire assesses the symptoms and disability of patients with patellar tendinopathy. It is a questionnaire with eight questions, six of them on a Likert scale, ranging from 0 to 10 points, where 0 represents the maximum severity of the disease and 10 represents no pain or limitation. Question 7 has four possible answers (0, 4, 7 and 10 points). Question 8 has a subdivision (8A, 8B and 8C), in which only one can be answered, depending on the perception of pain during sport activities, varying up to 30 points. The total score of the questionnaire varies between 0 and 100 points, with 100 points corresponding to the absence of pain or disability.

This outcome will be evaluated by an 11-point scale ranging from 0 to 10, in which 0 represents "no pain" and 10 represents "pain as bad as it could be." The participant will classify his average pain in the last 7 days.