Many girls experience premenstrual syndrome PMS which is re a group of physical, cognitive, affective, and behavioural symptoms that occur cyclically during the luteal phase of the menstrual cycle and resolve at or within a few days of the onset of menstruation. In young adolescents symptoms might particularly affect school functions, and social interactions in a negative ways in this study we will figure out the effect of 2 kinds of exercises in the management of this syndrome.

Fourty adolescent girls were divided randomly into two equal groups, Group (A) will consist of (20) adolescent girls age ranged from 14-17 suffering from PMS without any pathological cause they will receive an aerobic exercise on land in form of walking on the treadmill for 20 min 3 times per week for 3 months. Group (B) will consist of (20) adolescent girls age ranged from 14-17 suffering from PMS without any pathological cause they will receive an aerobic exercises in water in form of walking on the treadmill for 20 min 3 times per week for 3 months the assessment of the PMS symptoms will be done by Premenstrual distress questionnaire

Inclusion Criteria:

• All participants virgin females.
• Their age ranged from 14 to 17 years old
• their body mass index (BMI) ≥ 18 ≤ 25 kg/m2.
• They are clinically and medically stable during the study,
• they have regular menstrual cycle of 23 to 35 days and not participated any type of unusual diet during the period of the study.

Exclusion Criteria:

• All females in this study are free from: cardiopulmonary or orthopaedic problems, taking any hormonal drugs for three months at least, participating in any form of activity rather than the prescribed one in the study, any abnormality in ovulation or pelvic inflammatory diseases (PID).