Pendulum Squat: the machine quad-builder
The pendulum squat is a machine squat where the load travels on a curved arc with your back supported, giving a deep, quad-focused squat with low spinal stress. The arc is what makes it feel different from every other squat machine.
How to do the pendulum squat
- Step in with your back and shoulders against the pad, lower back supported.
- Place your feet on the platform hip-to-shoulder-width — lower for more quad, higher/wider for more glute.
- Shift your weight onto your feet and release the safety lock.
- Bend your knees and lower deep into the squat, keeping your back pressed to the pad and knees tracking over the toes.
- Pause at the bottom, then drive through your heels to stand, squeezing the quads at the top.
Keep the whole foot planted throughout.
Sets and reps
A guided machine squat — go deep and control the descent.
| Goal | Sets | Reps |
|---|---|---|
| Strength | 3–4 | 6–8 |
| Hypertrophy | 3–4 | 10–15 |
| Endurance | 2–3 | 15–20 |
Muscles worked
Primary — the quadriceps.
Secondary — the glutes, adductors, hamstrings, calves, and core.
Common mistakes
- Shallow depth — the deep stretch is the benefit; aim for at least 90° of knee flexion.
- Rushing reps — control the eccentric.
- Hips coming off the pad — adjust your stance so you stay seated against it.
- Heels lifting — keep the whole foot down.
Variations and alternatives
- Foot-placement variations to shift between quad and glute bias.
- The hack squat is the linear-sled cousin — a straight 45° path instead of an arc.
- A belt squat is a good no-pendulum-machine alternative.
For more quad work, see the leg extension and zercher squat guides.
Common questions
What muscles does the pendulum squat work?
Primarily the quads, with the glutes, adductors, hamstrings, and core assisting.
Pendulum squat vs hack squat — what's the difference?
Both are machine quad squats, but the pendulum moves on a curved arc and keeps the torso more upright, often feeling deeper and easier on the knees and ankles; the hack squat sled moves in a straight 45-degree line.
Is the pendulum squat good for beginners?
Yes — the guided path removes the balance demand, so it's beginner-friendly. Start light and focus on depth and control.
Why is the pendulum squat so hard at the top?
Its resistance curve makes the top of each rep harder than other squats, which is part of why it builds the quads so well.
Setting your squat numbers? Work back from a recent hard set — estimate your max without testing one, or use the 1RM calculator.