Lateral Step Up on the Smith Machine

The lateral step up drives the body sideways onto a box rather than forward, and that direction is what makes it worth doing. Stepping laterally loads the gluteus medius of the working leg, the muscle responsible for stabilising the pelvis and for stopping the knee collapsing inward, which a forward step up barely touches. Using a Smith machine adds load along a fixed vertical path, so you can train the pattern heavily without the balance problem that a free barbell would create in an already unstable sideways position. Choose a box height that lets the working thigh reach roughly parallel at the bottom, and drive entirely through the foot on the box. The trailing leg should not push off the floor, since that is the compensation that empties the exercise of its purpose. Step down under control rather than dropping, since the lowering phase is where the gluteus medius does most of its stabilising work on this movement.