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Do any of you run happy people do interval training? I'm looking for recommendations on interval timers to run on my android based phone. I've looked the play store but there does not seem to be a clear leader. I'm now starting to look through reviews through Google but, I thought ... what a better place to get a recommendation than from my fellow Nerds! Thanks.

I just got a Samsung Galaxy S3, going to be up to date with phone technology for a whole 2 weeks before the S4 hits stores! But hey, after the announcement I was able to get the S3 for free. The last phone was a Blackberry so I have never used any of these fancy fitness apps. Tell me what are the essentials I should be checking out?