Legs
The main area this variation is designed to train.
Exercise guide
Leg Extensions
Learn how to do the Leg Extensions exercise, which muscles it works, the equipment you need, and common mistakes to avoid.
Machine
Use this to decide whether the movement fits your current setup.
Beginner
A quick checkpoint for how simple or technical the movement usually feels.
Legs
Secondary support can come from other nearby stabilizers depending on how you perform the movement.
Strength
Movement pattern: extension. This is more of an isolation-focused exercise.
Learning and repeating well
Use this page to understand the setup first, then track the movement consistently in Logbook once it fits your program.
Instructions
How to do Leg Extensions
Keep the setup simple, use a controlled pace, and repeat the same movement pattern each rep.
- For this exercise you will need to use a leg extension machine. First choose your weight and sit on the machine with your legs under the pad (feet pointed forward) and the hands holding the side bars. This will be your starting position. Tip: You will need to adjust the pad so that it falls on top of your lower leg (just above your feet). Also, make sure that your legs form a 90-degree angle between the lower and upper leg. If the angle is less than 90-degrees then that means the knee is over the toes which in turn creates undue stress at the knee joint. If the machine is designed that way, either look for another machine or just make sure that when you start executing the exercise you stop going down once you hit the 90-degree angle.
- Using your quadriceps, extend your legs to the maximum as you exhale. Ensure that the rest of the body remains stationary on the seat. Pause a second on the contracted position.
- Slowly lower the weight back to the original position as you inhale, ensuring that you do not go past the 90-degree angle limit.
- Repeat for the recommended amount of times.
Benefits
- Builds strength and control through the legs region.
- Makes it easier to focus on one area when you want extra practice or volume.
- Gives you a repeatable way to track progress inside Logbook over time.
Common mistakes
- Using more weight or speed than you can control cleanly.
- Cutting the range of motion short and rushing through the reps.
- Changing your body position between reps instead of keeping the movement repeatable.
Related workouts
Workout templates that use this exercise.
If you want to see this movement inside a more complete training session, start here.
4-Day Upper Lower Split
A simple four-day split that gives each half of the body two quality sessions each week.
View workoutLeg Day Workout
A leg day that covers squat strength, posterior-chain work, and enough accessory volume to grow.
View workoutSquat-Focused Workout
A lower-body workout that biases squat strength while still supporting long-term lower-body development.
View workout5-Day Bodybuilding Split
A traditional five-day bodybuilding split for lifters who enjoy focusing on one or two regions per session.
View workoutRelated exercises
More exercises in the same lane.
Use these when you want a similar movement pattern, a different setup, or more exercise options for the same target area.
Calf Press On The Leg Press Machine
Calf Press On The Leg Press Machine is a beginner strength that mainly trains your legs using machine.
View exerciseChair Squat
Chair Squat is a beginner strength that mainly trains your legs using machine.
View exerciseLeg Press
Leg Press is a beginner strength that mainly trains your legs using machine.
View exerciseLying Leg Curls
Lying Leg Curls is a beginner strength that mainly trains your legs using machine.
View exerciseFAQ
Common questions about Leg Extensions.
Use these answers as a practical starting point, then adjust based on your setup, comfort, and goals.
What muscles does Leg Extensions work?
Leg Extensions mainly works the legs. It can also involve supporting muscles around the same region depending on your setup and range of motion.
Is Leg Extensions beginner-friendly?
Yes. This exercise is listed as beginner-friendly, which usually means the setup and learning curve are more manageable.
What equipment do I need for Leg Extensions?
You will usually need Machine for this variation.
How should I progress Leg Extensions?
Start by making the reps smoother and more repeatable. Once the whole set looks controlled, add a small amount of load or one extra rep at a time.
Track this exercise for free in Logbook.
Once the movement is in your plan, use Logbook to record sets, reps, load, and progress without guessing what happened last week.
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