RecruitingBehavioural interventionExploring the Feasibility of an Exercise and Noninvasive Brain Stimulation Intervention in Breast Cancer SurvivorsThe purpose of this study is to assess the feasibility of a 4-week intervention combining exercise and transcranial alternating current stimulation (Ex+tACS) in breast cancer survivors who report experiencing cancer-related cognitive impairment. Feasibility will be assessed by measuring participant retention, adherence, satisfaction with the intervention, and safety. The researchers will also examine pre-to-post intervention changes in attention, executive function, working memory, perceived cognitive function, and physical function before, after, and four weeks post intervention completion in the Ex+tACS group compared to a control group who will receive exercise and a placebo tACS condition (CON).