Sign up for CNN’s Fitness, But Better newsletter series. Our seven-part guide will help you ease into a healthy routine, backed by experts . CNN  —  You may be able to lower your risk for developing heart rhythm abnormalities by speeding up your walking pace. That’s according to a large new study published Tuesday in the journal Heart, which found average or brisk walking paces were associated with 35% and 43% lower risks of all heart rhythm abnormalities studied, respectively, compared with a