The current Coronavirus Disease 2019 (COVID-19) pandemic is the most severe health crisisof the 21st century. This is not only due to the deaths caused by the disease. Peoplethat were affected by COVID-19 and supposedly recovered may suffer from long lastingsequelae. The presence of symptoms longer than 3 months after the infection with theSevere Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is referred to asPost-COVID-19 Syndrome or Long COVID-19. It is estimated that 10-20 percent of allinfected people are affected. The most common symptoms include persistent fatigue,reduced physical capacity, dyspnoea, ageusia, anosmia, musculoskeletal pain andneuropsychological complaints such as depression, anxiety, insomnia and a loss ofconcentration.Considering the novelty of the pathology, evidence on the successful treatment ofPost-COVID/Long-COVID is scarce. Physical activity has been established as a treatmentoption for chronic diseases that have similar symptomatic manifestations to those ofPost-COVID/Long-COVID. For example, exercise therapy has shown positive effects on thehealth status of patients with lung disease, depression, anxiety, insomnia and cognitiveimpairment. However, there has been controversy whether so-called Graded Exercise Therapy(GET) is a safe treatment strategy for patients with Chronic Fatigue Syndrome (CFS). Thispopulation may experience Post Exertional Malaise (PEM), a worsening of symptoms afterphysical, cognitive or emotional exertion. Since COVID-19 might be an infectious triggerfor CFS, particular caution has to be taken when recruiting participants and whenscreening them for adverse events and worsening of symptoms during an exerciseintervention.It can be hypothesized that patients suffering from Post-COVID/Long-COVID can benefitfrom exercise in various ways, guaranteed that there is sufficient screening for PEMbefore and during the intervention and training volume and intensity are increased slowlyand progressively.The current study investigates the effects of a home-based concurrent training program onvarious parameters in people affected by Long COVID.