FITBODY Exercise Library · Legs
Stiff Leg Deadlift
The stiff leg barbell deadlift targets your hamstrings, glutes, and lower back, and it is one of the best movements for building posterior chain strength while improving how well you hinge at the hips.
What Is a Stiff Leg Deadlift?
The stiff leg barbell deadlift is a variation of the conventional deadlift. While a standard deadlift involves bending the knees significantly, the stiff leg version keeps your knees slightly bent but relatively fixed. That adjustment shifts the focus onto your hamstrings and glutes while still engaging your lower back for support.
You will also see it called the straight leg deadlift, though the name is a little misleading. Your knees are never locked out straight. They stay in a soft, unchanging bend the entire rep, and all the movement comes from your hips.
How to Do a Stiff Leg Deadlift
The single most common thing I correct on this lift is women chasing depth. If the bar has to reach the floor for the rep to count, your back will round to get it there and you have just traded a hamstring exercise for a lower back problem. Stop where your hamstrings stop. That point moves lower over the weeks all on its own, and it moves a lot faster than you would think!
Stiff Leg Deadlift vs Romanian Deadlift
These two get used interchangeably all the time, and they are not the same lift. The differences are small on paper and meaningful in practice.
| Stiff Leg Deadlift | Romanian Deadlift | |
|---|---|---|
| Knee bend | Minimal and fixed | Slightly more, still fixed |
| Starting point | Bar starts on the floor | Bar starts at the top |
| Bottom of the rep | Bar can touch down | Bar stays off the floor |
| Emphasis | Hamstring stretch and lower back | Glutes and hamstrings under constant tension |
A study comparing the two directly in trained lifters found meaningful differences in how the posterior chain muscles fire between them, which is a good argument for programming both rather than treating them as the same exercise. If the Romanian deadlift is what you are actually looking for, I have a full breakdown of proper deadlift form and the RDL.
What Muscles Does the Stiff Leg Deadlift Work?
The stiff leg barbell deadlift primarily targets the posterior chain. The hamstrings are the main focus, stretched hard during the lowering phase and contracting to drive you back up. The glutes extend your hips as you lift, and your erector spinae works throughout to hold a neutral spine. Worth knowing, a systematic review of deadlift variations found the erector spinae is heavily involved across all of them, which is exactly why back position matters so much on this lift. Compound posterior chain work like this is a cornerstone of body recomposition.
See the full muscle breakdown
- Hamstrings: the primary focus, lengthened under load during the lowering phase and contracted during the lift. This is the exercise that makes most women aware they have hamstrings.
- Gluteus maximus: activated to extend your hips as you drive the barbell back up to standing.
- Erector spinae: provides the stability and strength to maintain a neutral spine through the entire range, and works harder here than on many other lower body lifts.
- Core: engages to brace and protect your lower back and hold your posture as the bar travels.
- Lats and upper back: assist in stabilizing the barbell and keeping your shoulders retracted so the bar stays close to your body.
- Adductors: contribute to hip extension and help stabilize the pelvis at the bottom of the range.
Sets and Reps
This is not a lift where I want you chasing a one rep max. The hamstrings respond well to moderate loads through a full range, and your back position is the limiting factor long before your strength is.
| Goal | Sets | Reps |
|---|---|---|
| Strength and shape | 3 to 4 | 8 to 12 |
| Hamstring size | 3 | 10 to 12 |
| Learning the hinge | 2 to 3 | 8 to 10, light |
Program stiff leg deadlifts 1 to 2 times per week as part of a balanced lower body day. A simple beginner pairing is stiff leg deadlifts for 3 sets of 8 to 10, goblet squats for 3 sets of 12, and glute bridges for 3 sets of 15. More advanced lifters can run conventional deadlifts first, then stiff leg deadlifts as the accessory movement. Add weight only once your back stays flat for every rep, which is how progressive overload should work on a hinge.
Variations and Modifications
Dumbbell Stiff Leg Deadlift
Use dumbbells instead of a barbell. They allow a slightly greater range of motion, they are easier to bail out of if a rep goes wrong, and they need no rack. This is where I start most women who are new to the hinge pattern.
Single Leg Stiff Leg Deadlift
Perform the movement on one leg at a time. The balance demand is significant and it exposes side to side differences that a two legged version completely hides. If you want the full breakdown, see my guide to the single leg Romanian deadlift with dumbbells.
Deficit Stiff Leg Deadlift
Stand on a small platform or plate to increase the range of motion and the stretch. Only add this once your standard version is clean, because the extra depth is exactly where back rounding tends to creep in.
Romanian Deadlift
Similar movement with a slightly greater knee bend and the bar starting from the top rather than the floor. It keeps constant tension on the glutes and hamstrings and is often the more comfortable option if the stiff leg version bothers your lower back.
Common Mistakes to Avoid
- Rounding your back. Always maintain a neutral spine. Engage your core, keep your chest up, and stop the rep where your position holds rather than where you want it to reach.
- Locking the knees out straight. Despite the name, your knees stay slightly bent throughout. Fully locked knees put unnecessary stress on the joint and the hamstring insertion.
- Using too much weight. Start with a manageable load and build gradually. On this lift the weight you can move with a flat back is the only weight that counts.
- Rushing the movement. Lower slowly and with control. The eccentric is where most of the hamstring work happens, and dropping the bar wastes the best part of every rep.
- Skipping the warm up. Cold hamstrings are much more prone to injury on a loaded stretch like this. Warm up with dynamic movement or light cardio before your first working set.
Stiff Leg Deadlift FAQs
What is a stiff leg deadlift?
The stiff leg deadlift, also called the straight leg deadlift, is a barbell variation of the conventional deadlift where your knees stay slightly bent but relatively fixed throughout the lift. All the movement comes from hinging at the hips rather than bending the knees, which shifts the emphasis onto the hamstrings and glutes. Despite the name, your knees are never locked out straight. It is one of the most effective ways to build posterior chain strength and improve your hip hinge at the same time.
What is the difference between a stiff leg deadlift and a Romanian deadlift?
The main difference is the knee position and where the bar starts. Stiff leg deadlifts involve minimal knee bend and the bar starts on the floor, so it can touch down between reps. Romanian deadlifts allow slightly more knee flexion, start from a standing position, and the bar stays off the floor to keep constant tension on the glutes and hamstrings. Research comparing the two in trained lifters found real differences in how the posterior chain muscles fire, so both are worth having in a program rather than treating them as the same lift.
What muscles does the stiff leg deadlift work?
The stiff leg deadlift primarily works the hamstrings and glutes. The hamstrings are stretched under load during the lowering phase and contract to bring you back up, and the glutes drive hip extension at the top. Your erector spinae works hard throughout to hold a neutral spine, and your core braces to protect your lower back. Your lats and upper back stabilize the barbell and keep your shoulders retracted so the bar stays close to your legs.
Can beginners do stiff leg deadlifts?
Yes, with light weight and a focus on mastering the hinge before adding load. I usually start beginners with dumbbells rather than a barbell, since they are easier to control and easier to bail out of. Practice pushing your hips back while keeping your chest up and your back flat, and only lower as far as your hamstrings allow without your back rounding. Once the pattern is solid and repeatable, adding weight is straightforward.
How often should I do stiff leg deadlifts?
One to two times per week works well for most women as part of a balanced strength program. Because the exercise loads the hamstrings through a deep stretch, it creates more soreness than many lower body movements, so leave adequate recovery between sessions. Three to four sets of 8 to 12 reps is a solid working range. Pair it with squats and glute work rather than stacking it next to other heavy hinges in the same session.
Can I do stiff leg deadlifts with dumbbells?
Yes, and dumbbells are an excellent alternative to a barbell. They let you take the movement through a slightly greater range of motion, they need no rack, and they are far easier to set down if a rep does not feel right. The form is identical, so hinge at your hips, keep the dumbbells close to your legs, and stop where your hamstrings stop. This is my usual starting point with online coaching clients before moving to the barbell.
References
- Coratella, Giuseppe, et al. “An Electromyographic Analysis of Romanian, Step-Romanian, and Stiff-Leg Deadlift: Implication for Resistance Training.” International Journal of Environmental Research and Public Health, vol. 19, no. 3, 2022, article 1903, doi.org/10.3390/ijerph19031903. Compared posterior chain muscle excitation across the Romanian and stiff-leg deadlift in trained lifters at 80 percent of one rep max.
- Martin-Fuentes, Isabel, Jose M. Oliva-Lozano, and Jose M. Muyor. “Electromyographic Activity in Deadlift Exercise and Its Variants: A Systematic Review.” PLOS ONE, vol. 15, no. 2, 2020, e0229507, doi.org/10.1371/journal.pone.0229507. Found the erector spinae is substantially involved across deadlift variations. Worth noting that most studies in this area used male participants, so the findings should be read as directional for women rather than definitive.
- Cleveland Clinic. “Hamstring Muscle: What It Is, Anatomy & Function.” my.clevelandclinic.org/health/body/21904-hamstring-muscles.
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