Single-Leg Extension
Primary
Quadriceps
Secondary
Glutes
Equipment
Machine
Difficulty
Beginner
Type
Push
NASM-CPT, CSCS certified trainers. Every guide is built from peer-reviewed research and real coaching experience.
Use to address quad imbalances or for focused work. The Single-Leg Extension — a isolation pushing movement — is one of the most effective ways to train your quadriceps, with secondary work on your Hip stabilizers.
Everything You Need to Know About the Single-Leg Extension
The Single-Leg Extension is a good for beginners exercise that targets your Quadriceps. It's a popular choice for building strength and muscle in these areas. When should you use it? Use to address quad imbalances or for focused work. This timing makes the most of your workout and helps you get better results. Who is this for? Anyone wanting to isolate each quad. Whether you're just starting out or working toward a specific goal, this exercise fits into your routine.
Single-Leg Extension — targeted muscles
Primary
Secondary
Stabilizers
How do you perform the Single-Leg Extension?
- 1
Sit on the leg extension machine.
- 2
Position one ankle behind the pad.
- 3
Keep your other leg relaxed or off the pad.
- 4
Extend your working leg by straightening the knee.
- 5
Squeeze your quad at the top.
- 6
Lower with control and repeat.
What are the best tips for the Single-Leg Extension?
Use lighter weight than bilateral extensions.
Focus on the quad squeeze.
Control both the lift and lower.
Great for addressing imbalances.
Common Single-Leg Extension mistakes
Using too much weight.
Loading more weight than you can control on the Single-Leg Extension forces compensatory movement patterns that bypass your Quadriceps. Drop the weight until you can perform every rep with clean form — your results will actually improve.
Swinging or using momentum.
Bouncing or using momentum during the Single-Leg Extension takes work away from your Quadriceps and puts your connective tissue at risk. Control the weight through the full range — if you can't, lower the load.
Not achieving full extension.
Cutting the range of motion short on the Single-Leg Extension means your Quadriceps never reaches full stretch or full contraction. Research shows full range of motion produces significantly more muscle growth than partial reps at the same load.
Rushing through reps.
Rushing through the Single-Leg Extension reduces the time your Quadriceps spends under tension — which is one of the main drivers of growth. Aim for a controlled 2-second lowering phase on every rep.
Single-Leg Extension — who it's best for
Anyone wanting to isolate each quad.
How to Program the Single-Leg Extension
Lower reps with heavier weight builds raw strength. Your muscles and nervous system adapt to handle more load over time. This range is best for strength-focused goals.
This rep range keeps your muscles under tension long enough to trigger growth. Most people see the best muscle-building results in this zone. It balances strength and muscle size.
Higher reps with lighter weight builds muscular endurance and improves conditioning. This range is good for joint health and building work capacity.
General guideline: 3 sets of 12-15 reps per leg. Rest 45-60s.
What are good alternatives to the Single-Leg Extension?
Other Variations
- Pause Single-Leg Extension
- Tempo Single-Leg Extension
This Exercise Is in Your Plan
MySetPlan picks the right exercises for your goals — like the Single-Leg Extension — and builds them into a monthly program. Every set, every rep, planned out.
Take the Free Quiz2-minute quiz · No credit card
Safety Notes
- Use appropriate weight.
- Avoid jerky movements.