Sony makes a good case for sticking a fitness trainer right in your ear

MashableSony makes a good case for sticking a fitness trainer right in your earMashableWe 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 ...