ATG Split Squat: How to Do It, Progressions and Benefits
How to do the ATG split squat properly, with step-by-step cues, a slant board and elevated-foot progression, what the research says about knees past toes, and who should regress it.
By Nadia Popescu, Strength & Conditioning Writer · Updated 6 November 2026
The Poliquin step up is a short, heel-elevated step up (really more of a controlled step down and back up) that puts almost all of the work on the front of your thigh. You stand on a low step with your working heel raised on a wedge or small plate, lower your other foot slowly towards the floor while your knee slides forward over your toes, then press back up. It's named after Charles Poliquin, the Canadian strength coach who popularised it, and you'll also see a near-identical drill called the Peterson step up. Physios use it for cranky knees; lifters use it to build quads without loading the spine. Here's how to set it up and do it properly.
You don't need much. The two pieces that matter are a low, stable step and something to raise your heel.
The step. Aim for roughly 10 to 20cm. A bottom stair, an aerobic step or a solid stack of bumper plates works. Anything wobbly is a bad idea, since you'll be balancing on one leg with your knee well forward. If you'd rather use a box, a low setting on a plyo box is fine, though most are taller than you need here.
The heel lift. Somewhere between 2 and 8cm of heel height is the usual range. A 2.5kg or 5kg plate placed under your heel does the job, and so does a squat wedge. The Gravity Fitness rubber squat wedge is a small pair of blocks that stack to 3, 5 or 8cm, which suits a low step because the footprint (19.5 by 12cm) actually fits on top of one. A full-length slant board is usually too long to sit on a step.
Put the wedge at the back of the step so your heel sits on it and the ball of your foot sits on the step itself. Your non-working leg hangs off the front or side of the step, ready to lower.
The cue that makes it work
Think "knee forward, chest up". The heel lift exists so your knee can travel well past your toes without your heel peeling off. If you sit your hips back instead, the glutes take over and you've just done a small, awkward step up.
Your knee should track in line with your second and third toes the whole time. A slight inward drift on the last couple of reps is a sign the set is done.
The same exercise covers both goals; what changes is load, tempo and how far you push it.
Rest 60 to 90 seconds between sets. When you can hit the top of the rep range on every set with clean form, add a little weight or raise the step slightly.
It loads the quad hard with very little weight. Raising the heel and letting the knee travel forward increases the demand on the knee extensors and reduces it at the hip. Researchers measured this on a decline board during single-leg squats, a closely related setup: knee moment rose about 40% once the decline reached 15 degrees or more, while hip and ankle moments dropped (Zwerver and colleagues, 2007). The same study found patellofemoral forces climbed more steeply than tendon forces past about 60 degrees of knee bend, which is a good reason the Poliquin step up stays short.
It suits knee rehab. You choose the depth, the load and the speed to the centimetre, which is hard to do with a squat. That matters because exercise is the best-supported treatment for patellofemoral pain (pain around the kneecap). The 2016 international consensus statement recommends exercise therapy for pain and function and says combining hip and knee exercises beats knee work alone (Crossley and colleagues). So pair this with hip work rather than doing it on its own.
The evidence for supervised programmes is real, but modest. In a Dutch trial of 131 people with patellofemoral pain, a six-week supervised exercise programme reduced pain and improved function at three months compared with usual care, and the pain benefit held at 12 months, yet the difference in people reporting full recovery wasn't statistically significant (van Linschoten and colleagues, 2009). Expect gradual improvement, not a cure in a fortnight.
It's spine-friendly and needs almost no kit. No bar on your back and very light loads mean you can train your quads hard on days your lower back wants a rest.
One honest caveat: the Poliquin step up is often marketed as a way to "isolate the VMO" (the teardrop muscle above the inside of the knee). The quad muscles share a nerve supply and generally work together, and the case for any exercise singling out the VMO is weak. It's a good quad exercise. Leave it at that.
Using a step that's too high. A 30 to 45cm box turns this into a normal step up. Drop to 10 to 20cm and let the knee do the travelling.
Sitting the hips back. If your bum drifts behind you, the glutes and hamstrings take the load. Keep your torso tall and push the knee forward.
Dropping onto the free heel. Crashing down and pushing off the floor foot halves the work. Tap lightly, then go.
Rushing the lowering. The slow eccentric is where most of the benefit lives, especially for knees. If you can't control 2 to 3 seconds down, the load or the range is too much.
Letting the knee cave in. Watch it in a mirror. If it collapses towards the midline, reduce the range or the weight and work on hip strength too.
Pushing through sharp pain. Mild, settling discomfort during rehab is usually acceptable; sharp pain, pain that builds through the session or swelling the next day isn't. Back off and get it assessed.
Progress one thing at a time, roughly in this order:
When you've outgrown it, the sissy squat and the ATG split squat are the logical next steps for deep knee flexion under load. The Bulgarian split squat gives you more total leg loading with a bit more glute.
They look similar and train quite different things. A normal step up uses a box at roughly knee height, a flat foot and a strong hip drive, so it hits the glutes and quads together and lets you lift heavy. The Poliquin version uses a low step, a raised heel and an upright torso, so the knee travels far forward and the quad does the work through a short range. You'd use a normal step up as a main strength or conditioning lift and the Poliquin step up as a quad accessory, a warm-up or a rehab exercise. Plenty of people do both in the same week.
If knees are your main concern, our knee strengthening exercises guide has more moves to pair it with, including the hip work the consensus statement recommends.
It's a short-range, single-leg step up done on a low step with the heel of the working foot raised on a wedge or small plate. The raised heel lets your knee travel well forward over your toes, so your quad does almost all of the work. It's named after the strength coach Charles Poliquin, who popularised it, and it's often used for knee rehab and quad strength.
Mostly the quadriceps of the working leg, because the heel lift and forward knee position shift the load onto the knee and away from the hip. Your glutes, adductors and calf still help, and the hip stabilisers work to keep your pelvis level. It's often sold as a VMO exercise, but the evidence that any exercise isolates one part of the quad is weak.
Low. Something around 10 to 20cm is plenty for most people, which is why an aerobic step, a stair or a single plate stack works well. The point is a short range with the knee travelling forward, not a big climb. If you need to lean your torso forward to reach the floor, the step is too high.
It's a common choice in knee rehab because you can control the depth and load precisely, and exercise therapy has good evidence for patellofemoral pain. It isn't a guaranteed fix, though. Start with bodyweight, keep the range short enough to stay pain-free (or only mildly uncomfortable), and see a physiotherapist if pain is sharp, getting worse, or comes with swelling.
A normal step up uses a higher box, a flat foot and a big hip drive, so it trains the glutes and quads together. The Poliquin version uses a low step and a raised heel, keeps the torso upright and lets the knee move far forward, so it's much more quad and knee focused. You also usually emphasise the slow lowering rather than the push up.
For rehab or prehab, 2 to 3 sets of 12 to 20 slow reps per leg with bodyweight. For strength and muscle, 3 to 4 sets of 8 to 12 reps per leg holding dumbbells, using a 3-second lower. Two or three sessions a week is enough for either goal.
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