When I think of walking for cardio, I picture Jane Fonda-vibes outfits (hello, brightly-colored, high-cut Spandex and sweatbands), wrist and ankle weights, and wildly pumping arms. And then I shrug it ...

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 ...