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

This study is investigating whether a structured breathing practice can improve brain function and mental health in people with cancer or neurodegenerative diseases (like Parkinson's or Alzheimer's). The study has two parts: one for the general public and one focused on cancer patients and their caregivers. **You may be eligible if...** - You are physically able to do light exercise - You can read and understand English well enough to follow instructions and complete surveys - You have access to a smartphone or tablet - For Study 2: You have prostate cancer, a neuroendocrine tumor, or brain cancer (any stage) — or you are the caregiver of someone with one of these conditions **You may NOT be eligible if...** - You are not physically able to participate in light exercise - You cannot understand English well enough to participate - You do not have access to a smartphone or tablet - Your cancer type (for Study 2) does not match the ones listed above Talk to your doctor to see if this trial is right for you.