Sometimes I look up my scheduled exercises, do two or three in a row, then get out my phone to look at the next exercise and find that it’s been on in my pocket the whole time, wasting battery, if I don’t remember to press the close/sleep button on my phone. The app should time out after 3 minutes or so like every other app (except actively playing Netflix/similar) on an iPhone does. Doesn’t need to be blaring full screen lights in My pocket.