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

Inclusion Criteria:

• Adults (18-30 years old) with chronic ankle instability
• Patient's Body mass index (BMI) will range from 18.5- 29.9 kg/m2
• A history of at least one ankle sprain with the initial sprain occurring 12 months prior to study
• Most recent injury 3 months prior to start of treatment with at least one day of interrupted desired physical activity and associated inflammatory symptoms (pain, swelling, etc.).
• A history of previous giving way and/or recurrent sprain, and/or feeling of instability to injured ankle.
• Cumberland Ankle Instability Tool: score of ≤ 24.

Exclusion Criteria:

• Other lower extremity injury surgery 6 months before testing
• Patient suffered an acute sprain in the previous 6 weeks to the start of the study.
• History of neuromuscular disorders.
• Systemic diseases that affect balance.