While walking exercises performed outdoors are important within the scope of aerobic exercise, the continuity of outdoor walking exercises can be negatively affected by different weather conditions. Walking exercises performed indoors on a treadmill are a good option for patients in terms of increasing exercise continuity and patient compliance. Walking outdoors supported by a treadmill and mobile application may increase aerobic capacity and quality of life in patients with fibromyalgia syndrome, as well as reduce kinesiophobia.

Inclusion Criteria:

1. Be between the ages of 25 and 55
2. Be female
3. Have not engaged in regular physical activity for the past 3 months
4. Have been using the same medical treatment for at least 1 month prior to the study (amitriptyline, duloxetine/milnacipran, pregabalin, cyclobenzaprine)
5. Volunteering to participate in the study
6. The patient's cognitive status being suitable for using a mobile application
7. The patient agreeing to the 'Personal Data Protection Law Information Text' in order to use the mobile application

Exclusion Criteria:

1. History of cardiac or pulmonary disease
2. Changes in medical treatment during the study period
3. Use of different injection methods (ozone therapy, neural therapy, acupuncture, etc.) at least 3 months prior to the study or during the study period
4. History of rheumatological disease
5. Pregnancy or breastfeeding
6. History of malignancy
7. Presence of psychiatric or neurological disease