 Study design: The primary aim of this study is to determine whether oncological rehabilitation results in reaching the goals of the NNGB for overweight breast cancer patients. A single-arm, experimental pre-post test design, evaluating preliminary effectiveness of a 12-week personalised oncological rehabilitation program in overweight or obese BMI 25 kgm2 breast cancer patients, on adjuvant anti-hormonal therapy will be used. The oncological rehabilitation program will vary according to patients baseline characteristics, possible functional limitations and personal preferences. Assessment of meeting the NNGB by accelerometry, of body composition, parameters of metabolic syndrome, health-related quality of life and self-efficacy, will be performed at baseline, immediately after completion of the 12 week study period and at follow-up 26 weeks after baseline 3 months after completion of the intervention. Changes in these parameters between baseline and 12 weeks and baseline and 26 weeks will be analysed. The secondary aims are to establish the effect of physical activity on the prevalence of metabolic syndrome, the quality of life and self-efficacy in this group of patients. These secondary parameters will be assessed as a positive reinforcement for patients to continue with the engaged physical activities. 