Known brain/leptomengial involvement of the disease, active neurological disease, dementia History of seizure disorder, cerebrovascular ischemia/hemorrhage, dementia, cerebellar disease, or any autoimmune disease with CNS involvement Neurological disorder (Parkinsons disease, dementia, multiple sclerosis) History of HIV-associated encephalopathy; dementia of any kind; seizures in the past months Existing diagnosis of any type of dementia History of significant neurologic or psychiatric disorders including dementia or seizures Any history of HIV-associated encephalopathy; dementia of any kind; seizures in the past months Known brain/leptomengial involvement of the disease, active neurological disease, dementia Other conditions which could jeopardize the subject's ability to comply with the protocol including but not limited to dementia, psychosis, or other major psychiatric disorder. History of significant neurologic or psychiatric disorders, including dementia or seizures that would impede consent, treatment, or follow up Serious or uncontrolled medical disorder (including infection or cardiovascular disease) or dementia or other serious psychiatric condition History of a prior symptomatic stroke, dementia, or other significant central neurologic condition (i.e. multiple sclerosis) Have dementia Other medical or psychological conditions that would make participation unsafe or inhibit our ability to test our primary hypothesis, e.g. Parkinsons disease, severe dementia Patients who are incompetent for interview (documented diagnosis of active psychosis or dementia) or unable to provide informed consent as assessed by the interviewer; or too sick to participate, as judged by a member of the research team or the exercise physiologist, or have been treated for another cancer History of neurological disease (e.g., Parkinsons Disease, dementia, mild cognitive impairment) Meet criteria for major neurological disorder, such as mild cognitive impairment or neurodegenerative disorders (such as movement disorders, dementia), that could be exacerbated by the administration of cannabis Patients who are incompetent for interview (documented diagnosis of active psychosis or dementia) or unable to provide informed consent as assessed by the interviewer; or too sick to participate, as judged by a member of the research team PATIENTS: History of Parkinsons disease or Alzheimers dementia History of neurologic illness such as stroke, multiple sclerosis, multi-infarct dementia, or Parkinsons disease or history of dementia or chronic fatigue syndrome Documented history of Alzheimers disease, dementia, or other neurologic deficit that could impact decision-making Known or judged to be cognitively impaired (e.g., dementia, retardation, psychosis) Have no documented or observable psychiatric or neurological disorders that would interfere with study participation (e.g., dementia, psychosis) Have no documented or observable visual, auditory, psychiatric, or neurological disorders that would interfere with participation (e.g., blindness, deafness, psychosis, or dementia) Have a history of dementia or major neurological illness Dementia (i.e., .XX or .XX) Individuals with pre-existing neurological disorder (i.e. brain tumors, dementia, Parkinsons disease, multiple sclerosis, seizure disorder) or diagnosed with metastasis cancer Any past neurologic insult that is known to affect brain function such as traumatic brain injury, dementia, encephalopathy, etc. History of Parkinsons disease or dementia Medical or psychiatric conditions (beyond ovarian cancer, its treatment, and its symptoms) that would impair our ability to test study hypotheses (e.g. cardiac, pulmonary, or orthopedic history that would prohibit a program of walking for exercise; psychotic disorders, dementia, inability to give informed consent) Diagnosis of dementia or unable to grant their own informed consent Neurologic disorders of stroke, encephalitis, dementia, epilepsy, Alzheimers disease, Parkinsons disease Participants must not have documented or observable visual, auditory, psychiatric, or neurological disorders that would interfere with study participation (e.g., blindness, deafness, psychosis, or dementia) Any major thought disorder (e.g., schizophrenia, dementia) Known history of cerebrovascular disease, dementia or prior non-mild traumatic brain injury Neurologic disorders (dementia) Diagnosis of dementia Patients with impaired decision-making capacity (such as with a diagnosis of dementia or memory loss) are not eligible for this study History of head injury or dementia. PHASE I: Women who have dementia (of any kind) or memory problems listed in their problem list PHASE I: Women that score > on the Orientation-Memory-Concentration (OMC) test (indicative of dementia) PHASE II: Women who have dementia (of any kind) or memory problems listed in their problem list and we will exclude women that score > on the OMC test (indicative of dementia) History of a seizure disorder, cerebrovascular ischemia/hemorrhage, dementia, cerebellar disease, or any autoimmune disease with CNS involvement