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

"There is big potential for the sport," says 33-year-old German slacklining enthusiast Damian Joerren, who visits China regularly and owns a slacklining gear company specializing in high-end gear. "China is a great country and has many very beautiful spots for highlining."

Mastering slacklining requires many attributes, including core strength, concentration, balance and creativity.

The sport has also been embraced by adventurers－skiers, glider pilots, trail runners and scuba divers－to enhance their performance.

Sports enthusiast Song Chunlei first met Zhang five years ago.

Back then, he just wanted to do slacklining as an exercise to improve his stability while ski jumping, but he soon took it up as a hobby.

"I enjoy walking peacefully on the rope while staying focused," he says. "And as your skills improve, the challenges you encounter also escalate ... which is very satisfying."