An individual's normal gait speed is a straightforward performance measure with powerful predictive capacity. Numerous studies show that a decline in gait speed is highly associated with greater mortality [1] and [2], greater functional disability [3], poorer quality of life [4], diminished cognition [5] and [6], increased health care spending [3] and [7], and thus, increased loss of independence. Critically, there are defined interventions to increase gait speed in at-risk community dwelling individuals [8] and [9]. Improved gait speed may lower the risk of the above health-related outcomes [10].