Participants
RECRUITMENT
Our participants were recruited from a drug rehabilitation center for males only in Chongqing, China. Inclusion criteria were males aged between 20 and 50 years and methamphetamine users (mainly used methamphetamine and were detained due to its consumption). Exclusion criteria were having regular exercise habits (to avoid additional exercise masking or amplifying the true effects of the intervention), having physical disabilities or other serious symptoms known to affect mobility, and having difficulties in following the intervention actions. This study involving human participants was reviewed and approved by the Institutional Review Board of the College of Physical Education of Southwest University. Participation in this study was purely voluntary. We introduced our plan and distributed recruitment messages to the detained people through routine meetings at the correctional center. Written informed consent to participate in this study was provided by our participants.