Comparison of the effect of stretching exercises and a combination of massage - stretching exercises on primary dysmenorrheal

INTERVENTION: Intervention 1: The first intervention group (stretching exercises), will receive abdominal, pelvic and groin stretching exercises , 4 days a week ,15 minutes each time for 8 weeks . Intervention 2: The second intervention group (massage and stretching exercises) will receive massage and exercise, 4 days a week ,15 minutes each day for 8 weeks. Intervention 3: The control group will not receive any intervention. CONDITION: Primary dismenorrhea. ; Primary dysmenorrhoea PRIMARY OUTCOME: Dismenorrhea. Timepoint: Before and after the intervention. Method of measurement: Base on McGill Pain Questionnaire(MPQ). INCLUSION CRITERIA: Having regular and painful menstruation Lack of severe stress such as the death of a family member