Distance Interval training

I'm looking for an app that would help with doing sprint interval training.

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E.g. I know of the App Seconds which allows me to set a varying interval based on time. i.e. 10 seconds run, 10 seconds walk, 20 seconds run, 20 seconds walk and so on

However I want to do training where it would go:

- 100 meters run

- 100 meters walk

-200 meters run

-200 meters walk

and so on

I don't have an athletics track near by so am looking for an app that can measure distance and then sound an alarm and then start measuring the next distance and then sound an alarm.

Anyone know a solution to this?

I also have a fitbit and want to know how to make the most out of it.

Thanks

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