LETTER TO THE EDITORDo fitter kids have bigger brains?Cristina Cadenas‐Sanchez Jairo H. Migueles Kirk I. Erickson Irene Esteban‐Cornejo Andrés Catena Francisco B. OrtegaFirst published: 16 November 2020 https://doi.org/10.1111/sms.13824 ht…