Liu believes that only people who love fitness and have the enthusiasm to share that experience can be good instructors. There are thousands of livestreamers and bloggers teaching exercise classes, "but checking whether he or she is enthusiastic when doing that is a good way to tell whether that person is a good choice to follow", he said.

"A good instructor knows how to organize the rhythm so people don't get bored or exhausted, but stay concentrated and get great results in toning their bodies."

To better help people exercise in his livestreams, Liu browses videos uploaded by participants under the name Liu Keng-hung Girls' Homework every day, so he understands individuals' fitness levels and the ways in which they need help.

"I give likes to some videos I see to encourage people to keep going, and I also point out if someone is doing a movement wrong. If I see that someone has improved, I comment to compliment them," he said.

Better lives

Wang, the fitness fan who posts videos of herself performing aerobic exercises at home every day, was even more encouraged when Liu replied to her video, saying her movements were proficient.

Online exchanges－not only with Liu, but also with other netizens who want to move toward healthier lifestyles－h(huán)ave contributed greatly to her improved fitness, she said.

"Most people still don't know healthy ways to work out or lose weight. Like other people, I tried weight-loss pills and other fitness products, but nothing worked," Wang said, adding that she felt she was "disgusting" when she had skin problems caused by sweat and excess underarm fat.

"There is no shortcut to health. It's more about dedication and a change of lifestyle. I'm happy to see that many people like me are stepping out toward healthier lives."

Liu said fitness is an important part of a healthy lifestyle, but it's not everything. "Healthy eating is even more important, but in addition to food and fitness, we all need to experience a wide range of outdoor activities," he said.