LOS ANGELES – Fitness shoes that wobbled into major-league popularity last year with names like Shape-ups, EasyTone and TrueBalance are getting a tough workout these days.

Heralded as the secret to tightening your buns, thighs and abs, the shoes — equipped with uneven soles designed to put muscles into overdrive — flew off the shelves last year as Americans, by one estimate, scooped up nearly 10 million pairs amid the latest fad in the finicky footwear industry.

Additional Photos

An employee adjusts a Skechers running shoe in a Manhattan Beach, Calif., store. The company is trying a lighter line. Jay L. Clendenin/Los Angeles Times

One year later, the shoes have fallen in popularity in a now-flooded market for the workout shoes, and companies are focusing more on lighter-weight shoes. Meanwhile, studies and lawsuits have repeatedly questioned whether toning shoes may really whip a flabby body into shape.

Although around for years, most Americans became familiar with toning shoes in 2009 and 2010 as companies hawked pairs for around $100. But now with the glut, prices have been cut and sales have dropped.

Reebok, New Balance and other brands have played a big role in the shoes’ popularity, but no one more than Skechers, the Manhattan Beach, Calif., shoe maker that makes Shape-ups and Tone-ups. The company’s sales and stock price soared in 2010, but no more.

On Wednesday, the company said it lost $29.9 million in the second quarter, compared with a profit of $40.2 million during the same period last year. Sales fell 14 percent to $434.4 million. The stock closed Wednesday at $14.30, down 4.5 percent, before the earnings report. The shares have plunged 28 percent year to date.

Company officials blamed the loss mostly on a tough market for toning shoes.

“We aggressively reduced our excess toning inventory during the second quarter by selling 2 million pairs of our original Shape-ups for a loss of $21 million,” Chief Operating Officer David Weinberg said in a statement.

“Every business faces challenges as they grow, and at this time last year we were experiencing record growth and were the leaders in an explosive new category of footwear,” Skechers Chief Executive Robert Greenberg said in a statement.

Skechers is currently rolling out a whole new line of lighter-weight, athletically styled Shape-ups and Tone-ups with smaller soles; those shoes were renamed “fitness” rather than “toning.”

“We are producing more lighter-weight Shape-ups for people who want a lightweight package and still engage in — let’s call it fitness,” said Leonard Armato, president of Skecher’s fitness unit. “We are evolving Shape-ups, and we are excited about that evolution.”

On a recent afternoon, retired salesman Keith Parker, 45, checked out a newly renovated Skechers store in Manhattan Beach. Pop music played while an audio recording urged shoppers to “step into your new body.”

Parker wasn’t so excited. His favorite shoe? A dark-brown European-style slip-on. He said he had no interest in exploring the store’s new wing, which held the company’s fitness and toning shoes.

Nearby, a cutout of Kim Kardashian, sporting a pink sports bra, proclaimed “the newest move in fitness is … tying your shoelaces!”

“That whole marketing pitch doesn’t float my boat,” the retired salesman said, looking toward the new room. “I’m in good enough shape just walking around.”

Others have also expressed similar skepticism since toning footwear took off.

Lawsuits have been filed against Skechers, Reebok and New Balance alleging deceptive marketing. The companies have responded by standing by their products.

Last year, the San Diego-based American Council on Exercise funded a study that found Skechers Shape-ups, Reebok EasyTone and Masai Barefoot Technology toned one’s muscles no more than normal running shoes.

And Consumer Reports, citing the shoes’ instability, recently said they “could send you to the couch with your foot in a cast.”

“Like any other high-heeled shoes, you’ve got to follow directions and instructions,” which for the original Shape-ups is walking, said Skechers’ Armato.

Skechers CEO Greenberg called the criticism nonsense, citing thousands of unsolicited letters from customers and company-sponsored studies that say his company’s shoes tone the body, relieve back stress and improve posture.

“I know in my heart we have helped so many people,” Greenberg said, his voice rising.

Maureen Dipasqual is a Skechers booster. At first her Shape-ups made her feet and ankles sore, but now, she said, daily hourlong walks have lessened her lifelong back pain.

“You feel like you are rocking, but they are great,” said the Arizona resident, 57, while helping her daughter move into a beachfront Marina del Rey, Calif., apartment.

Cristina Bacca of Huntington Beach, Calif., said her lime-green Reebok EasyTones “are making my butt look cute.” But the 21-year-old said you still need to put in the effort. “It’s not a miracle shoe, but if you keep working out regularly, it makes the results come quicker.”

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