Assessing the Stability of Transcranial Magnetic Stimulation Plasticity Responses

Inclusion Criteria: * Adult males and females aged 18-70 years old. * Primary language is English * Exercise clearance Exclusion Criteria: * Presence of cognitive, neurologic or orthopedic conditions that could affect performance of the testing and training procedures * History of migraines * History of fainting spells of unknown or undetermined etiology that might constitute seizures * History of seizures, diagnosis of epilepsy, history of abnormal (epileptiform) EEG or family history of treatment resistance epilepsy * Any current history of psychiatric illness * Any unstable medical condition * No medication is an absolute exclusion from TMS. Medications will be reviewed by the Principal Investigator and a decision about inclusion will be made based on the following: * The subject's past medical history, drug does, history of recent medication changes or duration of treatment, and combination with other central nervous system active drugs. * The published TMS guidelines review medications to considered with TMS (Rossi, Hallet, Rossini, Pascual-Leone, \& Safety of TMS Consensus Group, 2009) * Any metal in the brain, skull or elsewhere unless approved by the responsible MD * Any medical devices (i.e. Cardiac pacemaker, deep brain stimulator, medication infusion pump, cochlear implant, vagal nerve stimulator) * Intracranial lesion * Substance abuse or dependence within the past six months