If you have a Fitbit, you understand the power of feedback. I’ve never tried any other fitness watch, so I have nothing to compare it to, but I am addicted to my Fitbit and the feedback it gives me. It’s the rush of the little rocket ship that launches when I hit my step goal, the steps-per-hour rainbow I build when I hit my hourly goal, the exercise pentagon I piece together if I’m sufficiently active five days a week. It doesn’t matter if I already know, intellectually, that I’ve put in the effort, I crave the tiny electronic pat on the back. Or buzz on the wrist, if you will. Positive or negative, I’m a big fan of feedback. When I cook for you, I want to know what you think. Did it need more salt? Was it overdone? Could it use a dash of vinegar? Was it the best thing you ever tasted and you want more? Is this new blouse a bad color on me? Do I have something in my teeth? Is my mascara running down my face?...