It’s a dark and cold Wednesday night in Martinez, and Liz Carnathan, 36, is exhausted after a long day of working her job in healthcare. So, too, is marketing manager Stephanie Pacheco, 35, who spent ...

For many people, dance feels more like play than exercise, which helps to explain its enduring appeal as a workout. What began as “aerobic dancing” in the 1970s has evolved with exercise science (and ...