Hiit Workout Timer is a fitness app that helps with Hiit workouts. App keeps log of the workouts. You can customize your workouts based on your needs. Share your workouts on Facebook.
Use the this app during stretching. Setup 2 intervals hold time and rest time.
Use this app for weight training. Setup 2 intervals for training time and rest between sets.
I have even used this app for burger flipping during barbecue. Setup 2 intervals of equal time (e.g.. 120 secs) and when you here beeping sound, time to flip the burgers or rotate hot dogs.