Turn Your Smartphone Into the Ultimate Fitness Tracker

Sure, you can shell out between $100-150 for standalone fitness trackers like the FitBit Flex andJawbone Up24. But chances are, you already carry around an even more powerful tracker: your smartphone. These sensor-packed rectangles may be bigger than your average wrist-worn alternative, but they have all the same capabilities (many have far more). All you need are the right apps to unlock your phone’s fitness-tracking potential.

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