Plank Stopwatch Timer is a stopwatch / timer designed for plank workout.
No need to look at the screen for the time. The app speaks out the time so that you can concentrate on your core muscles and let go of the "time anxiety".
7min (Watch) Workouts is a completely independent app designed for Apple Watch which contains the famous scientific 7 minute workout and others.
The app makes use of heart rate sensors, estimates calories, contributes to Move and Exercise rings on Apple Watch. It is a cohesive fitness experience right on your wrist.