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.

The little voice inside my head started to get too loud and critical, so I went mirrorless to see if it made a difference. Me, I do. Over here. Yes, me. On a basic level, mirrors are good for tasks ...

The importance of positive mirroring in infant development is well established. Most therapists are introduced to developmental mirroring by studying Jacques Lacan, D.W. Winnicott, or Heinz Kohut.