“…Humans naturally walk in a manner that conserves energy; we optimize our cadence, step length, and arm swing to minimize metabolic energy consumption (1,2). It is a commonly held belief that deviations from this normal walking pattern increase energy expenditure (3,4). Certain diseases that affect gait, such as stroke, Parkinson's disease, and cerebral palsy, increase the net energy expenditure of walking by as much as 70% compared with healthy individuals (5-7).…”