Inclusion Criteria:  Healthy adults  a. Their age should be ranged between 20 - 75 years  Stroke patients  diagnosed with unilateral ischemic or hemorrhagic stroke a minimum of six months post stroke able to stand without support for 1 minutes medically stable with physician release  Exclusion Criteria:  Healthy adults  neurological diseases musculoskeletal diseases rheumatic diseases history of orthopedic surgery on spine or lower extremity  Stroke patients  other injuries or illnesses that affect standing or walking