The study will measure pressures and forces for ADL and simulated work using healthy volunteers. Sixteen volunteers will be chosen over a range of ages but specifically include similar numbers of early adulthood (18-44), middle age (45-65), and elderly (>65). Sixteen volunteers from each age group divided evenly by gender will be selected. Therefore, a total of 48 subjects will be tested, with an even number of male and female performing each of the activities listed above.