Hack Squat Machine
The Hack Squat Machine primarily works the Rectus Femoris, Vastus Lateralis, Vastus Medialis, with secondary activation of the Gluteus Maximus and stabilizer support from the Rectus Abdominis, Transverse Abdominis. It is a machine compound exercise at intermediate difficulty.
The Hack Squat Machine is a intermediate compound exercise performed with machine, following a squat movement pattern. It primarily targets the Rectus Femoris, Vastus Lateralis, Vastus Medialis, with secondary engagement of the Gluteus Maximus. This is a bilateral pushing movement, meaning both sides work together to generate force.
Squat with your back against a pad that slides along angled rails.
| Equipment | Machine |
|---|---|
| Difficulty | Intermediate |
| Type | Compound |
| Movement | Squat |
| Force | Push |
| Laterality | Bilateral |
| Primary | Rectus Femoris, Vastus Lateralis, Vastus Medialis |
| Secondary | Gluteus Maximus |
Muscles Worked
The Rectus Femoris, Vastus Lateralis, and Vastus Medialis are the primary movers, collectively driving the movement and absorbing the greatest share of the load. The Gluteus Maximus assists as a secondary mover, contributing to force production without bearing the primary load. The Rectus Abdominis, Transverse Abdominis act as stabilizers, maintaining joint position and postural alignment throughout the movement.
Primary Muscles
- Primary Muscle Rectus Femoris (quadriceps)
- Primary Muscle Vastus Lateralis (quadriceps)
- Primary Muscle Vastus Medialis (quadriceps)
Secondary Muscles
- Secondary Muscle Gluteus Maximus (glutes)
Stabilizer Muscles
- Stabilizer Muscle Rectus Abdominis (core)
- Stabilizer Muscle Transverse Abdominis (core)
How to Perform
Preparation
- Adjust machine seat and pads to fit body.
- Sit or position body in machine.
Execution
- Bend at hips and knees, lowering body until thighs are parallel to floor.
- Drive through feet to return to standing position.
- Repeat.
Comments
- Maintain control throughout movement to fully engage the Rectus Femoris, Vastus Lateralis, Vastus Medialis.
Tips & Common Mistakes
- Keep your chest up and spine neutral throughout — avoid rounding your lower back.
- Push your knees out in line with your toes as you descend.
- Aim for at least parallel depth — cutting squats short reduces muscle activation.
Programming Suggestions
Adapt your sets and reps to your training goal.
| 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 (Rectus Femoris, Vastus Lateralis, Vastus Medialis) and can be substituted based on your equipment or variation preferences.
Get this data via the REST API or MCP Server.