Having a big butt due to excess fat deposits isn't something to which you'd likely aspire. But you'd hardly dismiss the idea of being able to trim your excess fat and firm up your glutes through exercise. One exercise that you might think could yield results is the leg press, which you perform with a weight machine at the gym. Although this exercise can strengthen your glutes, it's unlikely to make your butt bigger.
Strength, Not Size
Whether you perform sled leg presses or lever leg presses, the exercise targets your quadriceps muscles. These muscles are the large muscles located in the front of your thighs and contribute to knee and hip movements. Your butt muscles, technically known as your gluteus maximus, contribute to the leg press exercise, but they aren't the target. Thus, while performing leg presses can strengthen your glutes, you're unlikely to build these muscles to the point that you notice a larger butt.