This app by Appventive is so awesome for runners like me or anyone that has a medical condition, allergies, etc. It’s basically the equivalent of a MedicAlert bracelet for your phone. It lets you input information about your blood type, medications, diseases, and any other information you think would be important for emergency responders. And it lets you input a number of contacts that can be called from inside the app. I have mine on the home screen of my phone.