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Mashable's Best: E-readers, robovacs, laptops, earbuds, smart home and more Look Up Say More Trending Now Mashable Selects Creator Playbook Back to School Good Connection: Uplifting stories for a digital age Switch Off Mashable Voices Safety Net Versus All Series Beats Powerbeats Pro 2 with heart rate tracking are just $199.95 Monitor your heart rate from your earbuds while you work out. Lois Mackenzie is a freelance reporter at Mashable. Over the years she has written for many publications, covering everything from the local news to the best pair of running shoes. You can find bylines in publications including Fit&Well, Metro, and Coach magazine, usually covering deals on everything from earbuds to TVs, or guides on how to beat your half marathon time.