Leg Extension

Muscles Worked

How to Perform

1. 1

   Setup: Sit on the leg extension machine and adjust the back pad so your knees align with the machine's pivot point. Position the leg pad just above your ankles on your shins. Your knees should be at 90 degrees in the starting position. Grip the handles for stability.

2. 2

   Starting Position: Sit upright with your back firmly against the pad and core engaged. Point your toes straight up or slightly inward. Take a breath and prepare to extend your legs. Keep your thighs pressed down against the seat pad throughout the movement.

3. 3

   Extend: Exhale and extend your legs by contracting your quadriceps, lifting the pad until your legs are almost fully straight. Focus on squeezing your quads hard at the top. Hold the peak contraction for a one-second count to maximize muscle activation.

4. 4

   Lower: Inhale and slowly lower the weight back down in a controlled manner. Resist the weight on the way down—don't let it drop. Lower until your knees return to approximately 90 degrees of flexion. Maintain tension in your quads throughout the descent.

5. 5

   Repeat: Without pausing at the bottom, immediately begin the next rep to maintain constant tension. Keep your movements smooth and controlled. Avoid jerking or using momentum. Focus on feeling your quads work through the entire range of motion.

Common Mistakes

• Using Too Much Weight

  Loading excessive weight forces you to use momentum and reduces quad engagement. This is an isolation exercise—use moderate weight with perfect form and squeeze hard at the top for best results.

• Lifting Hips Off Seat

  Arching your back and lifting your hips off the seat reduces quad isolation and can strain your lower back. Keep your glutes planted and back pressed firmly against the pad throughout.

• Rushing Through Reps

  Moving too quickly reduces time under tension and muscle activation. Use a controlled 2-second concentric, 1-second squeeze, and 3-second eccentric for maximum growth stimulus.

• Hyperextending Knees

  Locking out and hyperextending at the top puts dangerous stress on knee ligaments. Stop just short of full lockout and maintain tension in your quads throughout the set.

Pro Tips

• Point Toes for VMO

  Slightly point your toes inward to emphasize the vastus medialis oblique (VMO), the teardrop muscle above your knee. This helps build that impressive quad sweep and improves knee stability for other leg exercises.

• Pre-Exhaust Technique

  Perform leg extensions before squats or leg press to pre-fatigue your quads. This ensures your legs fail before your back or cardiovascular system, maximizing quad growth without needing extreme weights on compound lifts.

• Drop Sets and Partials

  Leg extensions are perfect for intensity techniques. Try drop sets by reducing weight 20-30% and repping to failure. Or add partial reps at the end—when you can't do full reps, pump out half reps to completely exhaust your quads.

• Single-Leg Variation

  Train one leg at a time to identify imbalances and ensure equal development. Use 50-60% of your two-leg weight and focus on mind-muscle connection. This unilateral work dramatically improves quad symmetry and control.

Variations

Alternatives

Related Leg Exercises