Evolution of Clinical and Motivational Constructs During the Physical Activity Program KHEOPS, Already Offered to Patients at the Centre Léon Bérard

CANDY is a single-center, prospective study designed to observe the evolution of clinical and motivational constructs during the APA program KHEOPS program, already offered to patients at the Centre Léon Bérard (CLB). The main aim of the CANDY study is to observe the evolution of psychological constructs derived from M-PAC during a 13-week KHEOPS APA program in women undergoing treatment for breast cancer. Secondary objectives are: * to examine the feasibility of psychological measures and participation in the KHEOPS program * to observe cancer-related psychological symptoms during the KHEOPS program and to investigate the links between the temporal evolution of psychological factors (clinical and motivational) and adherence to the KHEOPS program, as well as the level of post-program PA during and after the KHEOPS program in patients followed at the CLB.