The goal of this clinical trial is to learn if Taekwondo training works to help adults with ankylosing spondylitis and axial spondyloarthritis. It will also learn about the safety of Taekwondo training for these adults. The main questions are as follows: * Will Taekwondo training affect disease activity, functional improvement, and quality of life? * Will there be a difference between adults who participate in Taekwondo training and adults who continue with their usual treatment? * Is Taekwondo training safe for adults with ankylosing spondylitis and axial spondyloarthritis, and will it be an appropriate exercise for these adults? * Is there a possibility to develop a structured Taekwondo-based exercise program for adults with musculoskeletal disorders? Participants will: * Be a part of the Taekwondo training group or the control group for 12 weeks (where the control group will later participate in the same 12 week Taekwondo for comparison) * Be assessed within 2 weeks before the start of the training * Be assessed within 1 week after completing the training