The heart rate zone formula is flawed, especially for women. Here's how to rethink your training.

That tension becomes especially clear with heart rate zone training, a popular five-tier system that endurance athletes use ...

Get stronger in 4 weeks with this beginner-friendly exercise plan

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 ...