RunKeeper has audio control, splits, tracking, maps, HR connection. I don't run... but if I decide to...
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Set weekly workout goals with the new RunKeeper iPhone update
How to calculate your maximum heart rate to know how hard you’re working during your cardioPS: the “fat burning zone” (about 60% to 70% of your maximum heart rate) doesn’t mean you’re burning more fat. It just means the body burns a higher percentage of calories from fat when in this zone. However, at higher intensities (70-90% of your maximum heart rate), you burn a greater number of overall calories.