Going out for a run used to just be about lacing up your sneakers. Now when you head out, you can feel like you’re drowning in tech: GPS watches, sports bands, sweat-proof earbuds, smartphone apps with cadence-matching playlists. And that’s before we even talk about what’s on your feet.
But we wouldn’t subject ourselves to this mountain of gadgetry if it didn’t really help. As our goals become more minute and more ambitious, training “by feel” doesn’t cut it anymore — you need the hard performance data and sophisticated tracking abilities only things like wearable sensors can provide.