Over the next 4 weeks, you’ll follow a specific workout plan each day: strength training, optional cardio/steps, active recovery, or rest. Each strength workout includes a warm-up and a cooldown ...

If you’ve ever held a plank, paused at the bottom of a squat or pressed your palms together in front of your chest, you’ve done an isometric exercise. Ta-da! These holds might look simple — after all, ...