Table 1.

Categorization of different activities.

Activity Category	Description	Activities
Light intensity activity (LIA)	Users perform common daily life activities in light movement condition.	Working at a desk, reading a book, having a conversation
Moderate intensity activity (MIA)	Users perform common daily life activities in moderate movement condition.	Walking, walking downstairs, walking upstairs
vigorous intensity activity (VIA)	Users perform vigorous activities to keep fit.	Running, rope jumping
Fall	Users accidentally falls to the ground in a short time.	Forward falling, backward falling, left-lateral falling, right-lateral falling