It’s been three years since I started using my wearables to count my steps. Three years of trying to hit the daily 10K target, closing rings, and going to sleep knowing that I accomplished something productive. But then I put another smartwatch on my wrist in an attempt to see how different those results were. Both watches were on the same wrist, at the same time, counting the same walk. One said 8,400 steps, while the other said 6,900. Same wrist, 1,500 steps apart. So naturally, I had a small crisis about everything I thought I knew. The strange thing is that nobody really tells you this when you buy a fitness tracker. The packaging doesn’t read “lab accurate, not life accurate” or anything remotely close to this idea. The app never mentions the fact that two people who own wearables from the same company might actually have their steps counted differently. But when you start looking into how wearables calculate your steps, things make more sense than you think.…