RecruitingBehavioural interventionImproving Cognitive Function Through High-intensity Interval Training in Breast Cancer Patients Undergoing ChemotherapyThe purpose of this research is to determine whether a 16-week high intensity interval training (HIIT) exercise program will improve brain health among women undergoing chemotherapy and also improve cardiovascular (heart) function. The names of the study interventions involved in this study are/is: * High-Intensity Interval Training (HIIT)