Impact of a Physical Activity Program to Reduce Long-term Cancer-related Fatigue in Metastatic Testicular Germ Cell Tumor Patients

Inclusion Criteria: * Men ≥18 years * With a metastatic germ cell tumor histologically confirmed (seminoma and non-seminoma) * Who have already undergone an orchidectomy (since the 16th december, this criteria was deleted). * Having a first line of chemotherapy planned with BEP, EP or VIP * Having a smartphone (i.e. to connect the activity tracker) * PS \< or = 2 * Whose ability to practice an adapted physical activity (APA) has been certified by a medical certificate issued by the referring oncologist or the investigating physician * Available and willing to participate in the study for the duration of the intervention and follow-up, * Able to understand, read and write French, * Affiliated with a social security scheme, * Having dated and signed an informed consent. Exclusion Criteria: * Presence of symptomatic bone and/or brain metastases * Central nervous system involvement with neurological deficits preventing walking * History or coexistence of another primary cancer (apart from in situ cancer of any location and/or basal cell skin cancer and/or basal cell skin cancer and/or a cancer in complete remission for more than 3 years), * Contraindication to physical activity (e.g. uncontrolled hypertension, uncontrolled heart disease) uncontrolled heart disease), * Unable to be followed for medical, social, family, geographical or psychological reasons, during the entire study period, * Deprived of liberty by judicial or administrative decision, or adults protected by law, * Concurrent participation in another study in PA.