Because of metastatic Non-Small Cell Lung Cancer (mNSCLC) and its treatments, patients suffer from numerous symptoms such as dyspnea, muscle atrophy, pain, fatigue, loss of appetite, altered physical condition and lung function, which may further impair the patient's overall condition. Nevertheless, it has been suggested that physical exercise could improve response to treatment at the clinical level due to its known effects on the immune system. Moreover, preclinical studies have shown that exercise performed during chemotherapy administration could result in physiological benefits such as improved intra-tumoral infusion and drug delivery. The ERICA study aims to assess the feasibility of an acute physical exercise immediately before immunotherapy and chemotherapy administration in patients with mNSCLC.