Dorinda Medley wants you to sweat for a good cause. The former “Real Housewives of New York” star and professional aerobics instructor is teaching an ’80s-themed aerobics — or Dorobics, as she likes ...

Ask any millennial what comes to mind when they think of aerobics videos, and they’ll likely give you a familiar image: watching their mom bop along to Jane Fonda in the living room. It’s what ...