Muscles Worked
Learn more in the Quads training guide →
Primary
Quads
Highlighted muscles
How To Perform
- 1 Adjust the machine so the ankle pad sits just above the foot.
- 2 Sit upright with back against the pad and grip the handles.
- 3 Extend the legs to full lockout, pausing to squeeze the quads.
- 4 Return slowly — the eccentric matters for quad development.
Form Cues
- ✓ Full extension at the top — do not stop short of lockout.
- ✓ Slow the eccentric phase — lowering in 2–3 seconds increases time under tension.
Common Mistakes
- ✗ Not achieving full knee extension.
- ✗ Using momentum and swinging the legs up.
- ✗ Sitting too far back — the pad should sit just above the ankle joint.
💡 Professor Splits Says:
Progressive overload is the engine of muscle growth. Track your weights and aim to add small increments weekly. For Leg Extension, this means gradually increasing load, volume (sets × reps), or decreasing rest periods over time.
Exercise Alternatives
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Where This Exercise Fits
FAQ
How many sets of Leg Extension should I do?
3 sets of 12–20 reps is a solid starting point. Adjust based on your training frequency and overall weekly volume for quads. Beginners should start with the lower end; advanced trainees can push toward the upper range.
What muscles does Leg Extension target?
Leg Extension primarily targets the Quads.
Is Leg Extension good for beginners?
Leg Extension is beginner-friendly. Focus on technique with lighter loads before adding weight.
How much rest between sets?
For Leg Extension, 60 sec of rest between sets is recommended. Isolation exercises can typically use shorter rest periods (45–90 sec) to maintain the pump and time efficiency.