Denise Austin has been inspiring women to get fit and have fun for four decades. As one of the key figures of the '80s aerobics boom, she knows a thing or two about fitness trends and which exercises ...

While talking to my coworker about my Shape Up series, I mentioned I wanted to take a dance class. She swore by Grit Fitness’ step aerobics class, so I signed up for an evening session. I was pumped.

A bubbly ball of energy in a crop top, ’80s-style hot pants and platinum mullet, Emilia Richeson-Valiente shakes her hips to the B-52’s’ “Private Idaho” inside a studio space at Live Arts Los Angeles ...