This is an intervention study that will determine whether an exercise program targeting spinal extremity range of motion for individuals with Parkinson's Disease, is superior to general conditioning and to 'usual care'. This study builds on previous findings of Schenkman and colleagues including the following: loss of spinal and extremity range of motion occur as sequelae to PD; these losses contribute significantly to early impairments of balance; and both spinal range of motion and balance of people with economy of movement is impaired in people who have PD. Specifically, we will examine whether the intervention, targeting range of motion and balance, also improves economy of movement.