METHODOLOGY: 30 patients will be selected (male and female) with chronic primary insomnia. (Clinical diagnosis based on DSM-IV) referred for ambulatory sleep disorders Sleep Institute - AFIP. The protocol will be conducted at the Center for Psychobiology and Exercise (CEPE) of the AFIP and the Sleep Institute. Each patient will undergo an initial interview that will aim to clarify the objectives and procedures of the protocol, as well as obtaining the signature of the Consent for Participation in Research. During the interview, a questionnaire will be applied (Sleep Quality Index in Pittsburgh) (68) for assessment of subjective sleep complaints and depression scale (Beck Depression Inventory, BDI) (69). Then the patient will be submitted to general clinical examination, blood collection and conduct examinations and resting electrocardiograms. Later, it will be subjected to a polysomnographic procedures. Volunteers will be randomized into 3 groups of 10 participants, which will hold a resistive exercise and the other stretching exercise and other will be a control group. Inclusion criteria are: age between 30 and 55 years, clinical diagnosis of primary insomnia (DSM-IV, ICSD, 2005), complaints of insomnia for a period longer than 6 months and have at least one day complaining of prejudice resulting from insomnia (such as moodiness, irritability and/or cognitive impairment). The non-inclusion criteria are: the use of psychoactive drugs, history of psychiatric disorders, shift workers, people with other sleep disorders and/or depression, significant abnormalities in laboratory tests and clinical trials have apnea/hypopnea index - AHI\> 15, present rate of periodic leg movements - IMPP\> 15, show abnormalities in heart tests (resting and exercise ECG) and blood that might impede the practice of physical exercises and practice regular physical exercise. This study will consist of three assessments: Pre-intervention (baseline), intermediate Rating (2 months) and post-intervention (at the end of 4 months). In each evaluation the volunteers must attend the lab of CEPE to achieve the following: blood collection, will be carried out in fast, always in the morning, body composition assessment, will be performed later to collect blood, a repeat maximum test - 1RM - only group that is performing the exercise resistance, actigraphy and sleep diary (15 days); polysomnographic studies and questionnaires. In the program of resistive exercise will be held 48 sessions that involve upper and lower limbs, abdominal and paraspinal region. There will be 4 exercises for upper limb: biceps, triceps, back and chest; 4 for the lower limbs: flexors, extensors, abductors and adductors, an exercise in trunk flexion to the region of the abdomen and an extension to the paravertebral trunk. It will be initially used a relative intensity 50% 1-RM. After 2 months of training intensity will be increased to 60% of 1-RM. Each exercise will be conducted in three sets of 12 repetitions, at intervals of 30 seconds between sets and one minute between each exercise. The total duration of the training session will be approximately 50 minutes. Before starting the training, participants will hold for 5 minutes stretching and warming on a bicycle ergometer (Life Cycle 9100) or treadmill (Life Fitness 9100) for the same period. After the session, the volunteers performed repeated stretches at the start of training. The group submitted to follow the practice of stretching protocol performed by Tworoger et al. that consist of 48 sessions of stretching for 60 minutes of low intensity, three times a week. The session will begin with 5 minutes of walking around the room, followed by 45 minutes of stretching exercises that involve the upper and lower limbs, 8 to 10 types for each region and end with 10 minutes of relaxation.