School of Architecture;
Harbin Institute of Technology(Shenzhen);
Shenzhen 518055;
Guangdong;
China;
Smartia Ltd.;
Bristol BS167FR;
UK;
First Affiliated Hospital;
Xi’an Jiaotong University;
Xi’an 710061;
China;
physical activity; passive assessment; marker⁃free motion tracking system; intra⁃class correlation coefficients; limits of agreement;