Respiratory Muscle Strength Training to Prevent Respiratory Muscle Weakness in Adults Newly Diagnosed With Breast Cancer

The goal of this clinical trial is to learn if respiratory muscle strength training can prevent respiratory muscle weakness in adults who are newly diagnosed with breast cancer and are planning to have surgery. The main question it aims to answer is: * Does respiratory muscle strength training in adults preparing for breast cancer surgery reduce the weakness that often occurs with surgery. Researchers will compare Guided Imagery exercises to respiratory muscle strength training to see which is more helpful. Participants will: * Carry out respiratory muscle strength training or Guided Imagery exercises for at least 2 weeks at home. * Meet with the researcher at home to complete breathing measurements before starting the exercises, after completing the exercises, and again after surgery. * Keep a diary of the exercises that have been completed.

Inclusion Criteria: * Community-dwelling adults (\>18 years) * Recently diagnosed with breast cancer * Scheduled for breast cancer surgery * English speaking, and can follow the protocol Exclusion Criteria: * Individuals who have already completed respiratory muscle strength training exercises * Pregnancy, * Recent pneumothorax * Ruptured eardrum * Uncontrolled hypertension, or uncontrolled reflux. * Individuals who cannot complete at least ten exercise sessions