"Trainer" app is a counter for interval training.

You can set following settings:
- how long should be a round
- how long should be the break (small break) after each round
- after how many rounds will be the big break
- how long should be the big break

Now you can start your interval training. Ten secons before each round or break ends, you hear three dongs. If a round or break ends, you hear a simple dong.

Screenshots: