Ankylosing Spondylitis (AS) is an inflammatory rheumatic disease primarily affecting the spine and sacroiliac joint. xercise is one of the most important nonpharmacologic treatment modalities in AS. Stretching, strengthening, aerobic, posture, balance and moltimodal exercise methods are the most commonly used treatment methods. The study will include 44 patients diagnosed with AS aged 18-65 years. Patients will be divided into two randomized controlled groups with 22 patients in each group. Group 1 will receive a personalized exercise program including stretching, strengthening, respiratory, aerobic and posture exercises via video conferencing. Group 2 will be recommended a video on the YouTube platform and will be asked to perform the exercises by following the content of these videos. Spinal mobility will be assessed with Bath Ankylosing Spondylitis Metrology Index, disease activity with Bath Ankylosing Spondylitis Disease Activity Index, function with Bath Ankylosing Spondylitis Function Index, quality of life with Ankylosing Spondylitis Quality of Life Scale and posture with PostureScreeen mobile application.