Interval training timer

Hello,

Wow what a cool app this sports tracker is. I just started with running and
as a beginner i want for example to run for 1 minute and walk for 1 minute.
This will be extended over a period of time. But i could not find any good
interval timer. Would be great if this would be integrated in Sports Tracker.

Or if anybody has any other suggestions please let me know.

Regards
Raptor71