Zhang practices slacklining in the space under high overpasses in Shanghai. [Photo by Zhang Zefeng and Zhao Zhongjun/China Daily]

Over the years, Zhang has been tackling balance as a slackliner. There was a time when he didn't yield to strong wind, which caused his right shoulder to get dislocated.

"When you are off balance, you face two choices－carry on or give up," he says. Giving up means starting again, while carrying on involves the risk of hurting yourself, which is very similar with issues in daily life.

"Slacklining makes you aware of when to continue and when to quit," he adds.

Inspired by "yogalining", which brings traditional yoga poses to the slackline, Zhang has been working on integrating martial arts and tai chi into the sport.