A theme which can be explored and expressed in a variety of different ways, existentialism is a belief based on the free will of the individual which suggests that all future development is created as a result of their own self determined actions.
People who do strengthening and toning exercises in an effort to trim fat from a certain area -- thighs, hips, stomach, or arms -- have the wrong idea. Although these exercises can help firm muscles, if the targeted area still carries an extra layer of fat, it won't look much different.
The hips and knees are the major joints involved in step-ups. The exercise begins standing, a posture in which both joints are fully extended. As you step up with your first foot, your hip and knee joints flex. To stand up on the platform with the second foot, the hip and knee joints of the first leg extend. When you step the second leg down, that hip extends while the hip and knee joints of the first leg flex.