Sony makes a good case for sticking a fitness trainer right in your ear
We know that fitness trackers are a thing, and headphones are certainly a huge thing, but are fitness-tracking headphones a thing? Sony wants to believe this is a new category, which is why it debuted the Smart B-Trainer back in January. It wasn’t the first manufacturer to build fitness-tracking tech into headphones, but it built on something Sony had been doing for a while: headphones that did a lot more than just relay sound.
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