Breathing Practice for Brain and Mental Health in Cancer and Neurodegenerative Diseases

Inclusion Criteria: * STUDY 1: Participants must be physically fit enough to perform light exercise. * STUDY 1: Should read and understand English well enough to consent, complete measures, and follow instructions. * STUDY 1: Must have access to a smartphone or tablet. * STUDY 2: Participants must be physically fit enough to perform light exercise. * STUDY 2: Cancer patients may have prostate cancer, neuroendocrine tumor, or brain cancer in any stage. * STUDY 2: The main focus is on pairs of cancer patients and their respective caregivers, but individual cancer patients or individual caregivers are also acceptable. * STUDY 2: Participants should read and understand English well enough to consent, complete measures, and follow instructions. * STUDY 2: They also must have access to a smartphone or tablet. * STUDY 3: Participants must be physically fit enough to perform light exercise. * STUDY 3: The patient should have multiple sclerosis. * STUDY 3: Participants should read and understand English well enough to consent, complete measures, and follow instructions. * STUDY 3: They also must have access to a smartphone or tablet. Exclusion Criteria: * STUDY 1: Participants incompatible with MRI machines due to factors such as pacemakers or metallic implants. * STUDY 1: Additionally, those with chronic medical conditions, including heart disease (coronary artery disease, congestive heart failure, hypertension, cardiac arrhythmia), chronic obstructive pulmonary disease (COPD), cy…