This study contains two pilot studies: 1) one study will investigate practice dosage of a
postural stepping task in healthy young individuals in order to determine an operational
definition of performance plateau, and 2) the other study will investigate whether practicing
beyond reaching a performance plateau improves learning of a postural stepping task in
healthy older adults, compared to discontinuing practice immediately after reaching a
performance plateau. The investigators hypothesize that the group that continues to practice
beyond reaching their performance plateau will learn and retain the motor task better than
the other group.