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Tabata training is a method of interval training that has been shown to be more effective for burning fat and building lean muscle mass than low-intensity, long-distance exercise (like jogging).

The premise is simple: sprint as hard as you can for 20 seconds, then rest for 10 seconds. Repeat 8 times. You're done in just 4 minutes!

The one problem? How do you know when 20 seconds have passed, when you're running as hard as you can?

Enter Tabata Sprinter! A panther snarls at you, telling you to run -- the sound of a predator plays against your body's instincts, telling it that it needs a bit of extra adrenaline. Later, when it's time to rest, a whistle blows.

You can play music while you're running the app, or just run the app by itself. All you need to do is make sure you can hear your iPhone while you're running.

Learn more about Tabata Sprints: http://www.marksdailyapple.com/what-are-tabata-sprints/