COVID-19 Group Inclusion Criteria  Having been diagnosed with COVID-19 at least 12 weeks ago, Being literate, Being in the age range of 18-65, Volunteering to participate in research, To be clinically stable, to be under control if any accompanying comorbid conditions (such as hypertension, diabetes), Not having any orthopedic and neurological problems that might interfere with evaluating peripheral muscle strength, balance and exercise capacity.  COVID-19 Group Exclusion Criteria Those with an ICU hospitalization history due to the diagnosis of COVID-19,  Recent myocardial infarction and pulmonary embolism. Having accompanying chronic diseases, Those who have any orthopedic or neurological disorders that will prevent walking, Another COVID-19 PCR Test positivity in the last 12 weeks, Not being able to cooperate and adapt to exercise test due to neurological influences such as cerebrovascular disease or psychiatric disorders, Healthy Group Inclusion Criteria Not having COVID-19, Being literate, Being in the age range of 18-65, Volunteering to participate in research. The Criteria for Not Including the Healthy Group in the Study Those who have any orthopedic or neuromuscular disorders that will prevent walking, Having any chronic illness or psychiatric conditions or mental afflictions that may interfere with cooperation or compliance with exercise tests.