Subject- The ID of the test subjectActivity- The type of activity performed when the corresponding measurements were taken
WALKING: subject was walkingWALKING_UPSTAIRS: subject was walking up a staircaseWALKING_DOWNSTAIRS: subject was walking down a staircaseSITTING: subject was sittingSTANDING: subject was standingLAYING: subject was laying down
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