The lower limb comprises the hip joint, knee joint, and ankle joint. These joints are connected to each other and provide overall support to the lower limb. Knee-in and knee-out that occur while ascending and descending the stairs or when standing up produce tensile and compressive stresses inside or outside the knee joint, which in turn cause pain. This paper introduces a method for determining the lower limb joint which is chiefly responsible for knee-in and knee-out. It also discusses how to implement range of motion exercises in patients with joint dysfunction. The trunk comprises the pelvis, spine, and thorax. The spine consists of 7 cervical vertebrae, 12 thoracic vertebrae, and 5 lumbar vertebrae. Although these bones generate only small movements individually, these bones function together to provide a wide range of body motion. This paper introduces a method for qualitatively evaluating body motion, in addition to conventional quantitative methods such as the range of motion test.