Welcome to CHEAP, our series about things that are good, but most of all, cheap. CHEAP! Research has shown that working out at your optimum heart rate will not only improve your overall health, but also deliver the most effective performance gains. And what better way to measure your heart beat than with a specialized fitness tracker – like Fitbit‘s Ionic watch, which also happens to be on discount right now? Isn’t that a wonderful coincidence? You can save a full $50 by taking advantage of this offer and purchasing a Fitbit Ionic for just $199.95 (20 percent off its…

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