An app for safe running

I am working on an idea and I want to ask the running community for feedback.
It's a mobile app. During setup, you enter an emergency contact into it. Then when you go running, you tell it that you are starting your run. If the app senses that you have stopped for longer then the preset amount of time (set by the user), say 1 or 2 minutes, it asks you if you are ok. If you do not respond, the app automatically sends a notification to your emergency contact. Letting them know that you were on a run, here is your location and that something happened and you need help. Please let me know your thoughts. Thanks.