the purpose of this study is to investigate the effect of core exercises on health status, pain, pressure pain thresholds and functional capacity in patients with FM

Fibromyalgia (FM) is a chronic non-degenerative disease of unknown etiology without effective medical treatment that mostly affects women. At present, the diagnostic and classification criteria are still under debate. As a result, the treatments for FM are also under investigation. No single treatment has achieved a reduction in the symptoms. Its occurrence increases with age. Exercise is one of the treatment approaches where effectiveness in the management of FM is supported by stronger evidence. Besides, recent reviews found that exercise has a positive effect on pain, physical function and health-related quality of life .with no associated adverse effects. Among the different exercise modalities available, core stability training has shown its effectiveness by improving static and dynamic balance, functionality and risk of falls, pain and quality of life. so This study will be conducted to investigate the effect of core exercises on health status, pain, pressure pain thresholds and functional capacity in patients with FM

Inclusion Criteria:

• 1. Patient referred from rheumatologist with a history of widespread bilateral musculoskeletal pain both above and below the waist for a minimum of three months and pain in at least 11 of 18 specific tender points 2. moderate or greater tenderness reported on digital palpation with 4 kg/cm2 of force 3. 21_43 years old patients

Exclusion Criteria:

- 1. presence of other systemic, somatic, or psychiatric diseases. 2. pregnant or were planning a pregnancy during the study period. 3. patients with acute disease including high fever and uncontrolled medical conditions (such as severe infection and cardiovascular disease including unstable angina.

4. surgical history for previous 6 months.