Table 1.

Definition of study phases in temporal order.

Study phase		Definition
Phase 1: validation study
	Validation of daily steps	7 days of wearing physical activity wearables in free-living conditions Fitbit-measured step count data were compared with those measured using ActiGraph
	Validation of floor count	4 bouts of upward stair climbing: 10 ft, 20 ft, 10 ft, and 20 ft in indoor stairwell (10 ft upward vertical displacement is equivalent to 1 floor count) Fitbit-measured floor count data were compared with visual observation
Phase 2: feasibility study
	Run-in (baseline)	10 days (including weekdays and weekends) before group allocation when baseline step count and floor count measurements were established
	Intervention	6 weeks of intervention (comprising 6 weekly challenges running from Monday to Friday) or 6 weeks of free living for the control group
	Ending	Last 10 weekdays (Monday to Friday of week 5 and week 6) of the intervention phase
	Postintervention	5 weekdays after the intervention phase