Back Extension
The Back Extension primarily works the Erector Spinae, Gluteus Maximus, with secondary activation of the Biceps Femoris (Long Head), Multifidus and stabilizer support from the Rectus Abdominis. It is a machine compound exercise at beginner difficulty.
The Back Extension is a beginner compound exercise performed with machine, following a extension movement pattern. It primarily targets the Erector Spinae, Gluteus Maximus, with secondary engagement of the Biceps Femoris (Long Head), Multifidus. This is a bilateral pushing movement, meaning both sides work together to generate force.
Machine back extension emphasizing lower back and glutes.
| Equipment | Machine |
|---|---|
| Difficulty | Beginner |
| Type | Compound |
| Movement | Extension |
| Force | Push |
| Laterality | Bilateral |
| Primary | Erector Spinae, Gluteus Maximus |
| Secondary | Biceps Femoris (Long Head), Multifidus |
Muscles Worked
The Erector Spinae, and Gluteus Maximus are the primary movers, collectively driving the movement and absorbing the greatest share of the load. The Biceps Femoris (Long Head), and Multifidus act as secondary movers, assisting the primary muscles and contributing meaningfully to the overall output. The Rectus Abdominis act as stabilizers, maintaining joint position and postural alignment throughout the movement.
Primary Muscles
- Primary Muscle Erector Spinae (back)
- Primary Muscle Gluteus Maximus (glutes)
Secondary Muscles
- Secondary Muscle Biceps Femoris (Long Head) (hamstrings)
- Secondary Muscle Multifidus (back)
Stabilizer Muscles
- Stabilizer Muscle Rectus Abdominis (core)
How to Perform
Preparation
- Adjust machine seat and pads to fit body.
- Sit or position body in machine.
Execution
- Extend through full range of motion against resistance.
- Return to starting position under control.
- Repeat.
Comments
- Maintain control throughout movement to fully engage the Erector Spinae, Gluteus Maximus.
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 | 3–5 sets × 3–6 reps at 80–90% 1RM with 2–4 minutes rest. |
|---|---|
| Hypertrophy | 3–5 sets × 6–12 reps at 65–80% 1RM with 60–120 seconds rest. |
| Endurance | 2–4 sets × 15–20 reps at 50–65% 1RM with 30–60 seconds rest. |
Alternative Exercises
These exercises target the same primary muscles (Erector Spinae, Gluteus Maximus) and can be substituted based on your equipment or variation preferences.
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