Low-intensity training is great for you, no matter what your fitness-tracking gadget says.

Few would disagree that cardio, also called aerobic exercise, is good for your health. Of the 10 most common chronic diseases, seven are "favorably influenced by regular physical activity," according ...

MARTIN: Did you get a workout in this weekend? How'd it go? MARTÍNEZ: I got two. One was an easy one, and the second one was I put myself through the ringer. MARTIN: (Laughter) Excruciating. OK.

Picture this: You’re headed out for a prescribed zone 2 training day, so you keep your run at what you think should be a relaxed pace. But quickly, you find yourself either panicking because you’re ...