Primary
Quadriceps
Secondary
Glutes
Equipment
Machine
Difficulty
Beginner
Type
Push
See how Single-Leg Extension could fit a workout
The example below shows one possible placement. Your purchased plan is built from your assessment, and Ely checks every exercise before approving it.
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This page is not medical advice or a rehabilitation protocol. Ely's personal review applies to purchased workout plans and does not replace an in-person assessment by a licensed healthcare professional.
The single-leg extension isolates each quadriceps independently, making it impossible for your dominant leg to compensate for the weaker one. This targeted approach identifies strength imbalances and allows you to correct them with focused training. Use lighter weight than bilateral extensions and focus on matching reps and tempo on each side.
When to use it
Use to address quad imbalances or for focused work.
Who it's for
Anyone wanting to isolate each quad.
Start with your weaker leg and match that performance with your stronger side—do not let the strong side do extra work. The goal is balance, not maximum weight. If one leg consistently falls behind, give it priority.
Browse all quadriceps exercises
Also targets: Glutes
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Sit on the leg extension machine.
Position one ankle behind the pad.
Keep your other leg relaxed or off the pad.
Extend your working leg by straightening the knee.
Squeeze your quad at the top.
Lower with control and repeat.
Use lighter weight than bilateral extensions.
Focus on the quad squeeze.
Control both the lift and lower.
Great for addressing imbalances.
Program single-leg extensions when rehabbing a leg injury, correcting known imbalances, or when one leg visibly lags in development. Use them as a finishing exercise after compound work, or as a warm-up to assess which leg needs extra attention that session.
Using too much weight.
Loading more weight than you can control on the Single-Leg Extension often creates compensations that shift work away from your Quadriceps. Reduce the load until each rep follows the intended path.
Swinging or using momentum.
Bouncing or using momentum during the Single-Leg Extension makes the movement harder to control and can shift work away from your Quadriceps. Use a load you can move smoothly through the intended range.
Not achieving full extension.
Cutting the range of motion short on the Single-Leg Extension can reduce the training stimulus for your Quadriceps. Use the largest comfortable range you can control without changing the intended setup.
Rushing through reps.
Rushing through the Single-Leg Extension makes it easier to lose position and harder to keep tension on your Quadriceps. Slow down enough to control both the lifting and lowering portions of each rep.
Anyone wanting to isolate each quad.
These ranges illustrate ways to organize training. They are not an individual prescription. Adjust them for the exercise, your experience, and the rest of your program.
Heavier loads can be useful for developing maximum strength. The range shown is an example, and the load must match your current technique and capacity.
Muscle growth can occur across different loads and repetition ranges. This example is not a uniquely effective zone; your overall program and effort also matter.
This is an example of a longer set. A repetition target alone does not establish joint safety or whether the exercise is appropriate for you.
Example: 3 sets of 12-15 reps per leg. Rest 45-60s.
Background for resistance exercises: the 2026 ACSM position stand covers healthy adults, and a load-comparison review found similar muscle growth across loads in studies using sets taken to muscular failure. These findings do not validate every exercise-specific range shown here or require training to failure.
This is one example of how Single-Leg Extension could sit inside a complete workout. Your plan may use different movements after Ely checks your assessment.
Sample workout
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Frequently Asked Questions About the Single-Leg Extension
The Single-Leg Extension primarily targets the Quadriceps, making it an effective exercise for quadriceps development. Secondary muscles worked during the Single-Leg Extension include Hip stabilizers, providing additional training stimulus. Stabilizer muscles engaged include Core.
Our library labels Single-Leg Extension as beginner. That category is not an individual assessment. Review the setup, movement instructions, and safety notes, and seek qualified guidance if you are unsure how to perform it.
The programming section shows examples for Single-Leg Extension. The appropriate amount depends on your current ability, the exercise, and your other training. The listed ranges are not an individual prescription or a guarantee of a particular outcome.
The main equipment listed for Single-Leg Extension is a machine. Check the instructions for any additional support, anchor, bench, rack, or clear space needed. The equipment label alone does not confirm that your home setup is suitable.
Good alternatives to the Single-Leg Extension include: Leg Extension, Sissy Squat. These exercises target similar muscle groups as the Single-Leg Extension and can be used as substitutes based on your equipment availability, gym setup, or training preferences.