Paper Title
Effect of Exercise to Improve Immunity during Home Quarantine due to Covid-19 Pandemic

Abstract
The outbreak of coronavirus has caused a severe crisis in the world and governments in different countries have been forced to enact laws to prevent its spread, leading to experiencing a psychological trauma by most people. On the other hand, physical activity has known to be one of the effective factors in improving people's physical and mental health conditions. The present study was conducted to investigate the effect of physical activity on perceived stress during coronavirus home quarantine. This literature review objectives to determine the advantages of physical exercise to expand body immunity for the duration of the COVID-19 pandemic. This study uses a literature review. Literature searches were collected using online database such as Science Direct, Springer Link, Wiley online Library, SAGE publication, NCBI and Google Scholar so that 12 articles were used in this literature review that published from 2019-2021. These articles are then analyzed by narrative literature review. Studies exhibit that moderate physical exercise can enhance body immunity and respiratory function. Moderate types of physical exercise such as aerobics can increasing the immunity by using the increasing the degree and function of T-lymphocytes, immunoglobulins, mainly Ig A and Ig G, regulating C-reactive protein levels to prevent limit lung feature and extend the vital capacity of the lungs. Regular physical workout of moderate intensity has been proven to extensively affect the immune system and reduce the threat of infection disease. Keywords - Covid-19; Immunity; Physical Exercise, Outbreak.