Leg Extension
The leg extension is an isolation exercise that primarily trains the quads. Equipment: machines. Suited to beginner lifters.
- Primary muscles
- Quads
- Secondary muscles
- —
- Muscle group
- legs
- Equipment
- machines
- Movement pattern
- Isolation
- Difficulty
- Beginner
- Also searched as
- leg extensions, quad extension, knee extension
Complete leg extension guides
- Proper formLeg Extension: Proper Form, Step by StepDefinitive leg extension form guide: setup, alignment, cues, breathing, tempo, common mistakes and fixes. Safety-first, practical coaching for clean reps.
- Muscles workedLeg Extension: Muscles Worked and Best AlternativesClear answer: leg extensions primarily train the quadriceps (vastus lateralis, medialis, intermedius, rectus femoris). Where it fits, programming tips, and 4 practical alternatives.
- Sets and repsHow Many Sets and Reps for the Leg Extension?Evidence-aware guidance for sets, reps, frequency, progression and when to add weight vs reps for leg extensions. Practical ranges for strength, hypertrophy, and endurance.
- Common mistakesThe Most Common Leg Extension Mistakes (and How to Fix Them)Fix the most common leg extension mistakes—pad placement, locking knees, momentum, overload, foot angle, machine fit—with clear fixes and safety tips.
- At-home alternativesLeg Extension Alternatives at Home (Minimal Equipment)Practical at-home leg extension substitutes using bodyweight, dumbbells, and bands. What each option preserves or loses compared to the machine, programming tips, and when to use a gym.
Related exercises
Train the same muscles or the same movement pattern.
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