The lack of observed changes in self-reported functional performance suggests that subjects did not perceive changes, ie, increases or decreases, in their day-to-day functioning. This is supported by the weak relationship observed between FPI total and FPI Physical Exercise scores and PA at baseline. It suggests that large changes in PA will be required before it is reflected in self-reported functional performance. This is useful information from a clinical perspective because it is important to avoid unrealistic expectations when prescribing an intervention of this nature.