A financial transaction card includes an enclosure, a step detector, and a processing device. The enclosure includes an account identifier linked to a financial account or record such that the financial transaction card can be used toward the purchase or use of at least one of goods and services. The step detector is positioned within the enclosure and configured to perceive movement caused each time a person carrying the financial transaction card takes a step. The processing device is positioned within the enclosure and in communication with the step detector, the processing device being configured to identify movement perceived by the step detector and to determine a cumulative number of steps taken by the person while carrying the financial transaction card. Stored-value card assemblies, methods of promoting sales of stored-value cards, methods of using a stored-value card, and other embodiments are also disclosed.