Control group
Participants randomized into the CG completed a 4-week conventional exercise program during routine HD visits for 30-min per session (including breaks), totaling 12 sessions. In each session, they participated in a conventional foot-rotation training implemented by a nurse under the non-weight-bearing condition. Similar to the iExergame training, the conventional training involved the participant to move the foot through full range of motion in sagittal (dorsi/plantarflexion), coronal (in/eversion), and combined (pro/supination) planes. Therefore, the conventional training was the same as the iExergame training in visit frequency, duration of each visit, tasks, and intensity.