One of the most common New Year's resolutions is to get fit and in China, the fitness industry is fast catching up. According to the Netherlands-based Sport and Leisure Consulting Group, the country could become the world’s biggest fitness market in the next 20 years as health concerns drag more and more Chinese to the gym.
No pain, no gain. Yiwei Wong is a regular at this gym - and he's determined to go harder.
"I'm a lawyer and work under lots of pressure. Going to the gym is a very efficient way to get rid of the pressure. Three years ago, I was a little bit overweight and I really felt there were a lot of burdens on me, so I decided to go to the gym. And it worked out," Wong said.
Yiwei says he spends 5 percent of his income on his fitness. That's good news for William Bai, who works at the gym as a personal trainer.
"I studied at Asia Academy for Sport and Fitness Professionals in Beijing. Most of my clients want to lose weight. There are also some who want to build muscle. They range from all ages, even children," Bai said.
China's fitness industry is small, but growing rapidly.
The number of gyms quadrupled between 2004 and 2012.
While revenues are up more than six-fold in the same period. At 3.7 billion dollars in 2012. And forecast to hit 6.8 billion dollars, by 2018.
With health and well-being a growing concern in China, because of air pollution -- and the rising rates of diabetes and obesity -- more and more Chinese are joining a gym to stay healthy.
With more cars and fewer bikes, along with more fast food and meat, many Chinese are getting unhealthier.
But experts say as their incomes rise, their health awareness rises too.
"In 2014, among urban residents, we found that health has surpassed income as their number-one concern. And we believe this change in disposition will be reflected in their consumption and lifestyle," Rachel Ma, vice president of consumer research, FMCG, Nielsen China, said.
Beijing's biggest gym charges membership fees of between 16,000 to 25,000 yuan a year - or around 2,500 to 4,000 dollars.
And aims to double its members, in 2015.
"Over the past year the membership's been growing steadily and we're now up to well over 1,000 members at Kerry Sports. We're looking to increase to over 2,000 members hopefully by the end of 2015," Ashley Skinner, director of Sports & Recreation, Kerry Center, said.
Along with the treadmill, traditional exercises are also gaining new followers. As more Chinese look to find their balance and keep in shape.