Resistance Training and Post Workout Protein to Improve Body Composition During Neoadjuvant Chemotherapy for Breast Cancer

This study is testing whether a supervised resistance training (strength exercise) program combined with whey protein supplementation can help women with breast cancer maintain or improve their body composition (muscle mass and body fat) while receiving chemotherapy before surgery (neoadjuvant chemotherapy). **You may be eligible if...** - You are a woman aged 20–89 with biopsy-confirmed invasive breast cancer - You are scheduled to receive neoadjuvant (pre-surgery) chemotherapy for breast cancer - You can read and understand English **You may NOT be eligible if...** - You cannot safely get up from the floor, squat, or perform basic exercise movements - You have severe arthritis, joint problems, heart conditions, or other conditions that make resistance training unsafe - You have lactose intolerance or an allergy to cow's milk or whey protein - You are pregnant - You are male Talk to your doctor to see if this trial is right for you.