Define custom activities and start them in this unobtrusive timer. Define repeatable activities and get notified when each of them finishes. Track how often an activity has been executed.
The Activity Timer can be used in a very generic way. Some people use is for storing the cooking/preparation time for their meals. They will get notified if the meal is ready. Others use the Activity Timer for productivity and to define working tasks in the timer, so they can focus on the task. Some people use the timer for work outs to track their repetitions. The timer notifies them while they are doing e.g. their push-ups.