The machine where you push a weighted platform with your feet is the leg press.
In a typical leg-press machine, the user sits or reclines against a backrest and pushes a platform away with the feet. The movement mainly involves knee and hip extension, recruiting the quadriceps, gluteus maximus, and hamstrings. Depending on the machine’s design, the platform may travel along angled rails, or the seat may move relative to a fixed footplate.
The leg press is often confused with the hack squat. Both train the lower body, but a hack squat generally uses a more upright, shoulder-supported stance and resembles a guided squat. A seated leg curl instead bends the knee against resistance, emphasizing the hamstrings, while a calf-raise machine focuses on ankle plantar flexion.
Because the torso is supported, the leg press can allow substantial lower-body loading without requiring the same balance demands as a free-weight squat. It still requires controlled depth, stable foot placement, and avoiding forceful locking of the knees. Different foot positions change joint angles and muscle emphasis, but no position eliminates the need for sound technique.