While walking or using the stair-climber or another cardio machine, you might focus on your breathing or heart rate to gauge how hard you’re working. That’s a perfectly good approach—but it won’t tell ...

While walking, hiking or doing other cardiovascular exercise, you might focus on your breathing or heart rate to gauge how hard you’re working. That’s a perfectly good approach, but it won’t tell you ...

Take this 3-minute stair test after 40 to see if your heart is decades younger. Simple, fast, and eye-opening.