The association of anthracyclines (ANT) and paclitaxel (Tax) is one of the main treatments used in breast cancer. These treatments are known to induce severe side effects such as a decrease in overall exercise capacity (physical condition) in response to muscle and cardiorespiratory alterations. If exercise may be an effective preventive strategy, it seems important to prescribe the most efficient exercise modality. Among them, concentric cycling (i.e., classic cycling) can significantly induce metabolic stimulus, which is needed for maintaining exercise capacity. The PROTECT-07 study aims to demonstrate the superiority of a training program based on concentric cycling during chemotherapy compared to standard treatment. The duration of the training program is 15 weeks with one session per week.