Trial design
This study was a randomized controlled trial with a parallel design, including two experimental groups and a control group, with an allocation ratio of 1:1:1. We offered 100 renminbi (RMB) awards per week to encourage participation. The study protocol has been registered in the Chinese Clinical Trial Registry under the registration. Recruited participants were allowed to withdraw or miss part of the exercise or test. However, one would be disqualified and excluded from the analysis if he had been absent for three consecutive exercises.