So you’ve been lifting, running, or training for a while, and you’ve asked yourself: Do I need to change my routine every few weeks? Some people swear by “muscle confusion,” while others say ...

Welcome to Workout Diaries, a series where we ask expert trainers to talk us through what a week of exercise looks like for them, helping you figure out how to develop and maintain an effective ...

Want to stay current with Arthur’s writing? Sign up to get an email every time a new column comes out. In a recent column, I wrote about the morning protocol I employ and recommend to increase ...