The intervention of the experimental group was based on dual-task treadmill walking while using the Virtual Reality (VR) tool.

The intervention of the control group was based on single-task treadmill walking.

Each training session began with 8 min of general warm-up and 2 min walk around the gym. Then, for safety reasons, the participants were attached to a harness. The participants began walking slowly on the treadmill for 3 min. In the following phases the participants walked at the same speed, while training with 3 VR games. Each session lasted 3 min, and 3 min of single walking was performed between VR sessions. After the final VR session, 2 min of single-task walking was performed in order to allow for recovery. The time walked in each trial from the starting point to the destination was kept constant at 20 min.

Activities-specific Balance Confidence (ABC) Scale is a 16-item questionnaire/survey. Each item is rated from 0% (no confidence) to 100% (complete confidence). Elderly respondents are asked to rate their confidence that they will lose their balance or become unsteady in the course of daily activities. ABC is an 11-point scale and ratings should consist of whole numbers (0-100) for each item. Participants should indicate their level of confidence in doing an activity without losing balance or becoming unsteady by choosing one of the percentage points on the scale from 0%-100%. Total the ratings (possible range = 0 to 1600) and divide by 16 to get each subject's ABC score. Scores lower than 50 indicate a low level of functioning, scores above 50 but below 80 indicate a medium level, and those over 80 indicate a high level of functioning.