This is an installment of Good Fit, a column about exercise. At Form Fitness, in Brooklyn, you’ll find an assortment of squat racks, dumbbells, and pull-up bars—which is to say, it’s a typical gym.

I wake up in the morning and look in the mirror. I shower and do my hair and makeup in front of a vanity mirror, then get dressed with the help of my full-length mirror. I have three mirrors in my ...

A mother and daughter's realization of the different reflection produced by a mirror, despite a visible item not being in front of the mirror, has left the internet confused. In a viral video, the ...