Introduction: Cancer treatment generates undesirable effects, directly affecting the functional and psychosocial capacity faced by breast cancer patients during treatment. In order to evaluate the practical effects of a pilates studio program that aims to promote significant improvements in their quality of life, emotional and social well-being. Objective: To assess quality of life, pain, fatigue, sarcopenia, flexibility of upper limbs, functional capacity, functional independence, general flexibility, strength of upper limbs and lower limbs, muscle mass, self-steem, anxiety and depression in women undergoing breast cancer treatment. Method: This is a cross-sectional study in which the sample will be composed of female individuals undergoing cancer treatment who participated in a Pilates studio program, twice a week lasting 60 minutes with light to moderate exercises, the intervention will last 16 weeks. The primary outcomes of study will be quality of life, pain, fatigue, sarcopenia, flexibility of upper limbs, functional capacity, functional independence. The secondary outcomes of study will be general flexibility, strength of upper limbs and lower limbs, muscle mass, self-steem, anxiety and depression in women undergoing breast cancer treatment. All evaluated using instruments: EORTC-QLQ-30 and EORTC-QLQ-23 questionnaires (European Organization for Research and Treatment of Cancer Quality of Life Questionnaire); Brief Pain Inventory; PIPER Fatigue Scale; SARC -F and SARC-Calf questionnaires; Back Scratch Test; Disabilities of the Arm, Shoulder and Hand Questionnaire - DASH; Six-minute walk test (6MWT) and 6-Minute Step Test; Barthel Index; Schober test; Handgrip Strength and 30-second sit-to-stand test; Bioimpedance; Rosenberg Self-Esteem Scale and Hospital Anxiety and Depression Scale (HADS), respectively. The data will be presented by descriptive statistics, for two independent samples and multivariate analysis, comparing the effects of the intervention between the two groups in the R 4.3.3 software. Expected results: Improvement in primary and secondary outcomes due to adjustments in physical training, Pilates studio.