Lever Leg Extension
The Lever Leg Extension primarily works the Rectus Femoris and stabilizer support from the Biceps Brachii (Long Head), Brachialis, Brachioradialis, Levator Scapulae, Trapezius (Middle), Trapezius (Upper). It is a machine isolation exercise at beginner difficulty.
The Lever Leg Extension is an beginner isolation exercise performed with machine, following a extension movement pattern. It primarily targets the Rectus Femoris. This is a bilateral pushing movement, meaning both sides work together to generate force.
A machine isolation push exercise targeting the Rectus Femoris.
| Equipment | Machine |
|---|---|
| Difficulty | Beginner |
| Type | Isolation |
| Movement | Extension |
| Force | Push |
| Laterality | Bilateral |
| Primary | Rectus Femoris |
Muscles Worked
The Rectus Femoris is the primary mover, taking on the bulk of the workload throughout the full range of motion. The Biceps Brachii (Long Head), Brachialis, Brachioradialis, and 3 other muscles act as stabilizers, maintaining joint position and postural alignment throughout the movement.
Primary Muscles
- Primary Muscle Rectus Femoris (quadriceps)
Stabilizer Muscles
- Stabilizer Muscle Biceps Brachii (Long Head) (biceps)
- Stabilizer Muscle Brachialis (biceps)
- Stabilizer Muscle Brachioradialis (biceps)
- Stabilizer Muscle Levator Scapulae (neck)
- Stabilizer Muscle Trapezius (Middle) (back)
- Stabilizer Muscle Trapezius (Upper) (back)
How to Perform
Preparation
- Sit on apparatus with back against padded back support.
- Place front of lower legs under padded lever.
- Position knee articulation at same axis as lever fulcrum.
- Grasp handles to sides for support.
Execution
- Move lever forward and upward by extending knees until legs are straight.
- Return lever to original position by bending knees.
- Repeat.
Comments
- Stabilizers (as seen below) may be used during heavy resistances to prevent body rising off of seat.
- Alternatively, seat belt can be used.
Tips & Common Mistakes
- Fully extend through the range of motion to achieve peak muscle contraction.
- Avoid hyperextending the joint at end range — stop just short of lockout.
- Control the return to take full advantage of the eccentric stimulus.
Programming Suggestions
Adapt your sets and reps to your training goal. As a beginner-friendly exercise, start with lighter loads and focus on form before progressing weight.
| Strength | 3–4 sets × 6–8 reps at 75–85% 1RM with 90–120 seconds rest. |
|---|---|
| Hypertrophy | 3–4 sets × 10–15 reps at 60–75% 1RM with 60–90 seconds rest. |
| Endurance | 2–3 sets × 15–25 reps at 40–60% 1RM with 30–45 seconds rest. |
Alternative Exercises
These exercises target the same primary muscles (Rectus Femoris) and can be substituted based on your equipment or variation preferences.
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