The Shake Light - Bright Torch app has a built-in torch that you can use to light up the darkness. Just shake your phone to turn on the torch. It's a really easy and quick way to use your phone's flashlight.

In this app, there is a built-in sensor that detects when your phone is in your pocket. It turns on the flashlight for you when you go for a run. You don't need to bother that the flashlight turns on when you go for a run. The flashlight can be used in any situation, such as when you need to light up the darkness or when you're looking for a light source. 

This app doesn't need any special permissions. 

This app is free to download.