The 45-degree leg press is a machine leg builder — a guided knee-and-hip extension that lets you load the quads and glutes heavily without the balance and bracing demands of a squat. Here's how to do it with good form, the muscles it works, how foot placement shifts the emphasis, the mistakes to avoid, and how to program it.
The leg press is a compound machine exercise built around knee and hip extension, so it primarily works the quadriceps and gluteus maximus, with the hamstrings and adductors assisting. You sit in the machine, place your feet on the platform, lower the sled by bending your knees until your thighs reach roughly a right angle, then press back up without slamming into a locked-out knee. Because the machine guides the path and supports your back, it's an easy way to add heavy leg volume — and where you put your feet changes which muscles do the most work.
The leg press is a compound lift that combines knee extension and hip extension, so it trains the whole front-and-back of the thigh plus the glutes at once. The quads and glutes do most of the work, with the hamstrings and inner thighs assisting. Foot placement shifts the balance: higher and wider feet pull more from the glutes and hamstrings, while lower and narrower feet bias the quads.
| Role | Muscles | What they do in the lift |
|---|---|---|
| Primary mover | Quadriceps | Extend the knees to drive the sled away from you |
| Primary mover | Gluteus maximus | Extend the hips as you press, especially from the bottom |
| Assisting | Hamstrings & adductors | Help extend the hip and stabilize the thigh under load |
| Stabilizers | Calves, core | Anchor the feet on the platform and keep you set in the seat |
Step-by-step form for the 45-degree machine leg press. If you're new, start light, learn the safety handles, and find your depth before loading up.
If you want to train the same pattern with a different emphasis or equipment, these are the common swaps:
The leg press fits almost any lower-body or leg day, usually as a main machine movement or as accessory volume after a squat. General starting points:
| Goal | Sets × reps | Notes |
|---|---|---|
| Strength | 3–5 × 4–6 | Heavier load, longer rest (2–3 min), full range, leave a rep or two in reserve on most sets |
| Muscle size | 3–4 × 8–15 | Moderate load, controlled tempo; the guided path lets you push close to failure safely |
| Frequency | 1–2× / week | Progress by adding a little weight or a rep when you hit the top of the range |
Want a full structured plan with the leg press built in? See Push Pull Legs, pair it with the squat and Romanian deadlift for balanced leg days, and read up on RPE to gauge how hard each set should feel.
Log every leg press set — weight, reps, and an RPE value — in LiftHero, and it charts your progressive overload and flags personal records so you can see your press climbing over the weeks. You can add warm-up sets, supersets and rest-timer holds, then drop the leg press into a saved leg-day routine so it's ready the next time you train. LiftHero records what you log; it doesn't diagnose your form.
It's a compound machine exercise that primarily works the quadriceps and gluteus maximus through combined knee and hip extension, with the hamstrings and adductors (inner thighs) assisting. The calves help stabilize at the platform.
Yes. Placing your feet higher and wider on the platform shifts more emphasis toward the glutes and hamstrings, while placing them lower and narrower biases the quads. A shoulder-width, mid-platform stance trains the legs fairly evenly.
Neither is strictly better; they do different jobs. The squat is a free-weight lift that also demands balance and core bracing, while the leg press guides the path so you can load the legs heavily with less technical and stability demand. Many lifters use the squat as a main lift and the leg press as accessory leg volume.
Lower the sled as far as you can while keeping your lower back and glutes flat against the pad. As soon as your hips curl under and your lower back lifts off the pad, you've gone too deep — reverse before that point rather than chasing extra depth.
For strength, about 4–6 reps across several sets; for size, about 8–15 (the guided path lets you push close to failure safely). Most lifters do 3–4 working sets, once or twice per week.
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This guide is educational and not medical advice. Consult a qualified coach or medical professional before starting or changing a training program, especially if you're new to lifting or returning from injury.
By Meitar Lazimi, founder of LiftHero · Last updated July 1, 2026.