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Kristin Rance works the rings during an Olympic weight-lifting class at District CrossFit in Washington; increasingly, women work out for muscle definition.
Kristin Rance works the rings during an Olympic weight-lifting class at District CrossFit in Washington; increasingly, women work out for muscle definition.
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When Kristin Rance joined a CrossFit gym in Washington about a year ago, she had one vision: muscle. The 30-year-old mother of two wanted to look in the mirror and see someone “who looks like [she] works out — without flexing,” Rance says. How she didn’t want to look? Skinny.

Over the past few years, women like Rance have been embracing the message that “strong is the new skinny” — that a body of muscle is better than a body of bones.

Gyms have entire marketing campaigns built around the motto, with ads featuring rock-solid women pumping iron and classes promoted as muscle-building rather than weight-losing.

Even the phrase itself has a following: Texas personal trainer and blogger Marsha Christensen trademarked it for goods in 2012, and she sells more than 400 different products online. Her “strong is the new skinny” Facebook page has nearly 117,000 “likes.”

Forget craving runway models’ stick-thin figures: Women now want Michelle Obama’s arms, Jillian Michaels’ abs and Lolo Jones’ legs. Today, says Nancy Burnham, general manager of the Washington gym Vida Fitness, “having a strong body and a positive body image is cool.”

But women’s health experts worry that the trend isn’t as positive as it seems because the focus is still on women’s appearance, not achievements. Equally discouraging, they say, is evidence that women are no more satisfied with their bodies today than in decades past.

“The female athlete portrays a little bit healthier body image than the Kate Moss, the Twiggy, the super-skinny supermodels,” says Boise State University psychologist Mary Pritchard, who studies eating behaviors and body image. “But at the same time, it’s still not realistic. We have jobs, we have kids, we have families. Our job is not to look and be like an Olympic athlete.”

Muscle is only the latest “must-have” for American women. In the 1950s, they admired curves … la Marilyn Monroe, but by the 1970s, thin was in. Large-scale studies of women have shown that muscle has been “creeping in” to that ideal for about the past 30 years, says psychologist Rachel Calogero of the United Kingdom’s University of Kent. But it’s not pushing thin out.

“What we’ve seen over the past several decades is something that we haven’t seen before: Women are reporting not only dissatisfaction with their weight but dissatisfaction with the amount of muscle on their body,” she says.

In other words, research suggests that “strong is the new skinny” is only half the truth: Strong and skinny is the new skinny.

Experts say one reason muscle is popular is the increased media attention on female athletes. “Women are arriving on the sports scene big-time,” Calogero says. “We value their achievements and accomplishments, and so the body type associated with that — we’re really starting to … incorporate that into our ideals.”

Gymgoers and fitness professionals say women’s desire for muscle also reflects current exercise trends that require strength. According to a survey of fitness professionals by the American College of Sports Medicine, high-intensity interval training — workouts characterized by short bursts of intense exercise — was named the top fitness trend of 2014. P90X (a home workout), CrossFit and boot camps all fit into this category.

“These are more than dance classes or step aerobics; they are … classes that are challenging in different kinds of ways that involve being strong, being able to do push-ups and pull-ups and squats and jumping off of benches and swinging kettle bells,” says Brian McGee, a personal trainer and owner of FIT 360, a fitness studio in the District of Columbia. “Challenging things that require strength.”

Group-based high-intensity interval workouts, participants say, build camaraderie in addition to muscle. They also allow individuals to continually reach new goals. That’s a draw for Rance, who couldn’t do a push-up when she first joined CrossFit.

“Seeing girls get excited when they hit a new personal record for a lift is awesome,” says Teresa Harris, a coach at Rance’s gym in the District. “It’s not how little food did they eat — they get excited about being strong.”

Whether or not strong is the new skinny, most fitness professionals agree it should be. Strength training is critical for women, despite lingering myths that it will make them “bulk up.” Building muscle helps prevent osteoporosis, boosts metabolism, improves balance and stability, and benefits the immune system.

“Stronger bodies recover faster; stronger bodies don’t break as easily, if they break at all,” McGee says.