We are living inÂ the golden age of fitness data. Our phones note every step we take and stairwell we climb. Our GPS watchesÂ record our heart rate and per-mile pace over the course of years. There are apps that count calories, macros, and ounces of water consumed with the ruthlessness of an IRS auditor. Tech-enabled mattresses even promise to optimize our bedtimes after learning about our sleep cycles. But pretty soon all that stuff will seem downright retro, thanks to a new wave of DNA tests that have the potential to make our current analytic accessories seem antiquated.
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