Leg Extensions (Leaning forward) with Machine
Adjust the machine seat so your knees are lined up with the axis of the machine's lever arm. The backrest should support your lower back.
Place your ankles under the roller pad, making sure it's positioned just above your ankles, not on top of them.
Keep your knees and feet about hip-width apart throughout the movement.
Sit up tall, engage your core, and lean forward in order to engage the upper part of the quadriceps. Avoid arching your lower back.
Grasp the side handles for stability if the machine has them.
Slowly extend your legs until they are straight and the weight stack is fully lowered. Focus on using your quadriceps to lift the weight.
Pause briefly at the top of the motion when your legs are straight. Do not lock your knees.
Slowly bend your knees to lower back down to the starting position in a controlled motion.
Breathe out as you lift the weight and breathe in as you lower it.
Complete the prescribed number of reps and sets. Start light to master the form before increasing weight.