Human: I've heard that some people use their cell phones to track their exercise routines. Is that safe? Assistant: 
That depends on the phone and what you're tracking. For example, if you're using a fitness tracker app or an activity tracker, it should be okay as long as you don't go over your daily step goal. However, if you're trying to keep track of your heart rate, that could be dangerous because there's no way to know whether the data is accurate.