The present study aims to examine the effects of 6-week home-based exercise program on disease activity, spinal pain, functional status, muscle strength and endurance among ankylosing spondylitis (AS) patients under medical therapy with/without tumor necrosis factor (TNF) inhibitor agents. Material and Methods: A total of 44 AS patients were included, 23 patients receiving at least three months of anti-TNF agents formed anti-TNF alpha group and 21 patients formed non-anti-TNF alpha group. Home-based exercise program was demonstrated by a physiotherapist to the patients in both groups and done every day for 6 weeks. Patients were evaluated at the beginning and the end of the 6 th week. Visual analog scale (VAS)-spinal pain, International Physical Activity Questionnaire-Short Form (IPAQ-SF), Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Functional Index (BASFI), and modified Schober test were performed. Isokinetic muscle strength was measured by an isokinetic dynamometer. Isokinetic parameters comprised peak torque (PT), peak torque/body weight (PT/BW) and work fatigue (WF) values. Results: At the end of the 6 th week, in anti-TNF alpha group, a significant improvement was observed in BASDAI, BASFI, modified Schober, chest expansion, PT, PT/BW and WF values (p<0.05). In nonanti-TNF alpha group, although an improvement was achieved in BAS-DAI, BASFI, VAS-spinal pain and chest expansion parameters (p<0.05), there was no improvement in modified Schober and isokinetic parameters (p>0.05). Conclusion: Home-based exercises provide improvement in disease activity, physical functioning, pain and spinal mobility, regardless of the medical treatment. Exercise has been determined to improve muscle strength in patients using anti-TNF alpha. Further studies are required to clarify the possible mechanisms.