Lower Extremity Mobility for CAI

This study will be conducted to determine the effect of addition of ankle mobility versus hip mobility exercises to traditional rehabilitation to patients with chronic ankle instability. the main purpose is to answer the following question: * out of these interventions which would better improve lower limb flexibility, range of motion, severity of functional instability and dynamic postural control? Researcher will compare between ankle mobility versus hip mobility exercises Participants will be allocated in 2 experimental groups: * group A will include 20 patients receiving conventional physiotherapy in addition to ankle mobility exercises * group B will include 20 patients receiving conventional physiotherapy in addition to hip mobility exercises Patients will receive 3 sessions per week for 6 weeks in a physiotherapy outpatient facility for both groups