Post-Coronavirus Disease of 2019 (COVID-19) Rehabilitation Clinics in Saudi Arabia

This intervention study aims to evaluate the before and after changes in physical fitness, cardiorespiratory status, exercise capacity, fatigue, anxiety, dyspnea, psychoemotional conditions, and quality of life through 3 sessions per week for 4-week of an intensive therapeutic program in post coronavirus survivors. In addition, it aims to answer the main questions before and after the clinical trial study. * Does three sessions per week for 4-week of an intensive therapeutic program improve patients' physical fitness, cardiorespiratory status, and exercise capacity? * Does it improve physical endurance and fitness, enhancing fatigue, anxiety, and dyspnea on post coronavirus patients? Participants will ask first to answer these questionnaires before and after the intervention. * Berg Balance Scale (BBS): to assess the patient's ability (or inability) to safely balance (standing, active, and fall risk) during a series of planned tasks. * The Modified Medical Research Council (mMRC) Dyspnea Scale: is used to assess patients' degree of baseline functional impairment due to dyspnea from respiratory diseases. * Depression, Anxiety, and Stress Scale- 21 Items (DASS-21): measures the emotional states of depression, anxiety, and stress. * Fatigue Assessment Scale (FAS): evaluates symptoms of chronic fatigue. * Quality of Life (QOL)-short form-36: to assess the quality of life and calculate eight subscales: physical functioning, role physical, bodily pain, general health, vitality, social functioning, role emotional, and mental health. After answering the questionnaires, the patients will then go through multiple tests before and after the intervention: * A 6-min walk test (6-MWT): is the primary measure of this study to assess aerobic capacity and endurance. * 10-meter walk test (10MWT): assess walking speed in meters per second over a short distance and assess capacity and endurance. * Time Up and Go (TUG) test: assess lower extremity function, mobility, and fall risk. T