Instructions

1

Sit on the leg extension machine with your back firmly against the backrest and hips seated on the machine seat. Position your legs under the leg extension lever pad, with the pad resting on the front of your lower legs just above your ankles. Keep your hands on the side handles for stability.

2

Adjust the machine seat so the knee joint aligns with the machine's pivot point. Grasp the handles firmly with both hands. Feet should be positioned hip-width apart with toes pointing forward. Ensure your back remains against the backrest throughout the movement.

3

Slowly lower the weight by bending your knees in a controlled manner, allowing the leg extension lever to descend. Lower until your knee reaches approximately 90 degrees of flexion. Maintain contact with the backrest and keep tension on the quadriceps throughout the descent.

4

Drive through your heels and extend your legs by straightening your knees, pushing the lever up against the resistance. Extend until your legs are nearly straight but knees remain slightly flexed at the top. Pause briefly at full extension and squeeze the quadriceps before beginning the next repetition.

PRIMARY MUSCLESRectus Femoris

SECONDARY MUSCLESVastus Lateralis, Vastus Medialis, Vastus Intermedius, Tibialis Anterior

EQUIPMENTLeverage machine

DIFFICULTYBeginner

Overview

When programming for Rectus Femoris growth, the Lever Lying Single Leg Curl stands out as a highly efficient Strength choice. Performing this movement with Leverage machine forces your stabilizer muscles to work in tandem with the primary movers, translating to functional strength and enhanced muscular endurance.

Benefits

Reduces the likelihood of Thighs injuries by reinforcing connective tissue strength.
Promotes balanced muscular development by effectively recruiting the Rectus Femoris and associated synergists.
Improves overall Thighs stability and proprioception during heavy loads.
Utilizes Leverage machine to create sustained mechanical tension, forcing deep muscle adaptation.

Common Mistakes

Shrugging the shoulders or compensating with secondary muscles rather than isolating the Rectus Femoris.
Using excessive momentum to swing the Leverage machine rather than controlling the eccentric phase.
Rushing the repetition tempo instead of focusing on the mind-muscle connection with the Thighs.
Losing core tension, leading to poor spinal alignment and reduced power output.

Pro Tips

Keep your breathing rhythmic: exhale sharply on the concentric push/pull, and inhale smoothly on the way down.

Muscle Anatomy

The primary driver is the Rectus Femoris. However, the movement also recruits Vastus Lateralis, Vastus Medialis, Vastus Intermedius, Tibialis Anterior to maintain control of the Leverage machine.

Beginner Tips

If you are new to the Lever Lying Single Leg Curl , focus on mastering the movement pattern with zero weight before adding Leverage machine.

Lever Lying Single Leg Curl