Barbell Hack Squat
Also works: Calves · Forearms · Hamstrings
The barbell hack squat holds the bar behind your legs at arm's length and squats it up off the floor. Loading behind the body forces a more upright torso and pins the work onto the quads and the grip, which is exactly what limits the movement: most people run out of hands long before they run out of legs.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Load the bar on the floor and stand directly in front of it, heels about 5 cm from the bar, feet shoulder-width.
- Squat down and take a double-overhand grip at roughly shoulder width, palms facing behind you.
- Use straps or hooks from the start. Grip is the ceiling on this lift and there is nothing to be gained by fighting it.
- Elevate your heels on 2.5 kg plates or a wedge — it keeps the shins forward and stops the bar dragging on your calves.
- Stand up to lockout with the bar hanging at arm's length against the back of your thighs. That is the starting position.
Every rep
Breathing & tempo — Inhale and brace at the top, hold through the descent, exhale as you pass the sticking point on the way up. Two seconds down, controlled and deliberate up.
Before you load it
- Squat down to take the grip and squat up to stand — do not round your back to pick the bar up behind you. The pickup is the most-injured moment of this lift.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Start with the empty 20 kg bar to learn the bar path against your legs. Working weight lands well below your back squat — around 50-60% is normal, because the position gives you no help from the hips. Add 2.5-5 kg once you can hit 12 clean reps with the torso staying vertical and no arm bend.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Push your knees forward as you descend and keep the chest stacked over the hips. If your torso is leaning past 20 degrees, the quads have stopped doing the work.
Lock the elbows straight and think of your hands as hooks on a chain. Any arm bend means the load is too heavy for a lift you cannot cheat anyway.
Use lifting straps every set. This is not a grip exercise, and treating it as one just means undertraining the quads it exists to build.
Raise your heels 2-4 cm on plates and start with your heels slightly closer to the bar. A more vertical shin path clears the calf entirely.
Why bother
With the bar behind you rather than on your back, the load line falls behind your hips instead of through them. That removes most of the forward-lean demand, keeps the torso vertical, and puts the knees in charge — this is a quad lift, not a hip lift, and it feels closer to a leg press than to a back squat.
It also does not touch your spine the way a loaded back squat does, which makes it a useful heavy-ish quad option in a week where your lower back is already busy. The catch is honest: the bar scrapes up the back of your legs, and double-overhand grip caps the load well below what your quads could take.
Where it fits
Second or third movement on a leg day, after your main squat or deadlift, for 3-4 sets of 8-12. It is a poor choice as a top-end strength lift because grip fails first. Do not pair it in the same session with heavy deadlifts unless you are happy to have nothing left in your hands.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
Same job, different kit
When this gets easy
Asked and answered
Is this the same as the hack squat machine?
No. The machine puts you on a padded sled with your back supported and the load in front of your shoulders; the barbell version has the load behind you and demands you balance it yourself. They both bias the quads, but the machine lets you go far heavier because grip and balance stop being the limit.
The bar keeps scraping my shins and hamstrings raw. What do I do?
Wear long socks or lightweight knee sleeves and keep the heels raised — most of the scraping comes from a bar forced to travel around the calf because the shin is too vertical. A knurled bar dragged up bare legs will draw blood eventually, and taping the centre knurl does nothing because the contact happens at the smooth section. This is the main reason people abandon the lift, and it is a kit problem rather than a technique problem.
Can I do this with a trap bar instead?
Yes, and for most people it is the better version. Standing inside a trap bar puts the load in line with your hips instead of behind them, so nothing scrapes your legs, the high handles remove the heel-elevation problem, and you can load far more. You lose the extreme quad bias that comes from the load sitting behind you. If you own a trap bar and your goal is leg size rather than the specific position, use it.
Can it replace the back squat?
Not really. It removes the spinal load and most of the hip contribution, which is both its selling point and its limitation. Treat it as a quad accessory that spares your back, not as a substitute for a heavy bilateral squat.