2.2.1. Experimental Participants

Twenty-one middle-aged and older subjects (age: 55.2 ± 4.2 years, height: 166.1 ± 7.9 cm, weight: 65.36 ± 8.3 kg) from a local Tai Chi academy participated in the algorithm validation experiment. For the sake of convenience, the experiment was conducted in the same Tai Chi academy instead of each subject's home. All the subjects were in healthy conditions and without musculoskeletal diseases or injuries that may affect their Tai Chi performance. Prior to the participation of the experiment, each subject signed informed consent on the experiment protocol, which was approved by the KAIST Institutional Review Board (IRB-18-070).
