Its important to fully train all muscle groups in your legs not just your quads

To get the full effect from the leg press exercise, it's best to control the eccentric (lowering) until your knees reach a 90-degree angle and be explosive on the concentric contraction (upwards) movement
Movement up should be smooth and don't pause or hesitate at the top.

1. Using a leg press machine, sit down on the machine and place your legs on the platform directly in front of you at a medium (shoulder width) foot stance.
2. Lower the safety bars holding the weighted platform in place and press the platform all the way up until your legs are fully extended in front of you.
3. As you inhale, slowly lower the platform until your upper and lower legs make a 90-degree angle.
4. Pushing mainly with the heels of your feet and using the quadriceps go back to the starting position as you exhale.
Repeat for the recommended amount of repetitions and ensure to lock the safety pins properly once you are done. You do not want that platform falling on you fully loaded.