Inclusion Criteria:  Functionally healthy adults that can move all four limbs within normal range of motion.  Exclusion Criteria:  People with the following conditions may not participate in the study: known bony injuries or fractures, open wounds, abscesses, infections of the soft tissue or bones, malignancies, auto-immune disorders affecting the musculoskeletal system (ex. lupus, rheumatoid arthritis), severe osteoporosis, aortic aneurysm, deep venous thrombosis, history of pulmonary embolism, bleeding disorders, neurovascular compromise, anticoagulation therapy, recent surgery, recent herniated discs, unstable heart conditions, and musculoskeletal strains or sprains, enlarged spleen or liver, mononucleosis, pregnancy, untreated hyperthyroidism.