Older adults have identified stair negotiation as one of the most difficult tasks attributable to aging and is one of the leading causes of fall related injuries. In a sample of 310 nondisabled older adults, more than 45% reported difficulties in climbing stairs, and about 30% reported difficulties in stair descent. If physical disability is superimposed on normal aging, the ability to negotiate stairs safely could be seriously compromised, which in turn could be a critical factor in the loss of independence in older adults.6 Understanding the normal, age-related alterations in movement control is important to provide a benchmark against which rehabilitation professionals working with a wide range of people with physical limitations can gauge mobility.