Dumbbell Stiff-Leg Deadlift
What Is the Dumbbell Stiff-Leg Deadlift?
Dumbbell Stiff-Leg Deadlift is a compound exercise that primarily targets the hamstrings and glutes and also engages the lower back, adductors and upper back. It is an intermediate-level movement that trains the hip hinge with the knees held nearly straight, which puts the hamstrings under a long, loaded stretch on every rep.
What sets it apart from the Dumbbell Romanian Deadlift is the knee angle and the depth, not the back. In the stiff-leg version the knees keep only a soft bend that does not change during the set, and the dumbbells travel lower, past mid-shin toward the tops of the feet. The Romanian version bends the knees more and sends the hips further back, so it usually stops around mid-shin. In both, the bend comes from the hips while the spine stays long. Because the hamstrings cross both the hip and the knee, straighter knees stretch them further at any given hip angle, which is why the stiff-leg version feels more demanding on the back of the thigh and usually takes less weight.
The exercise is mainly used to build hamstring and glute size and hip-extension strength. It usually sits after the main lift of a lower-body session as an accessory to squats and deadlifts, and it suits moderate loads and controlled reps far better than maximal attempts. Dumbbells let you load in small steps and set the weights down easily, while the Barbell Stiff-Leg Deadlift allows heavier loading and the Dumbbell Single-Leg Deadlift adds a balance challenge.
It suits lifters who already hinge well and want a longer hamstring stretch than a Romanian deadlift gives. If you cannot get the dumbbells past your knees without your lower back rounding, build the pattern first with the Dumbbell Romanian Deadlift or a Kettlebell Romanian Deadlift, where the extra knee bend gives the hamstrings more slack. Focusing on the stretch in the hamstrings on the way down and on driving the hips forward on the way up keeps the work in the legs and hips rather than the lower back.
Muscles Worked
- Biceps Femoris
- Primary
- Gluteus Maximus
- Primary
- Semimembranosus
- Primary
- Semitendinosus
- Primary
- Adductor Magnus
- High
- Erector Spinae
- High
- Upper Trapezius
- Medium
Instructions
- Stand with your feet about hip-width apart, holding a dumbbell in each hand with an overhand grip, arms straight and the dumbbells in front of your thighs.
- Unlock your knees into a slight bend, then keep that knee angle for the whole set.
- Brace your core, pull your shoulders back and down, and keep your neck in line with your spine.
- Hinge at the hips by pushing them back, lowering your torso toward parallel with the floor while your back stays flat.
- Let the dumbbells hang straight down and travel close to your legs, past your knees toward the tops of your feet.
- Stop when your hamstrings are fully stretched or just before your lower back starts to round, whichever comes first.
- Drive your hips forward and squeeze your glutes to stand back up, keeping the dumbbells close to your legs.
- Finish standing tall with your hips fully extended, without leaning back, then begin the next rep.
Common Mistakes
Rounding the back to reach the floor
Forcing the dumbbells lower than your hamstrings allow makes the spine round, shifting the load from the hips to the lower back.
Locking the knees back
Pressing the knees into a hard lockout strains the back of the knee, so keep a soft bend even though the legs stay nearly straight.
Bending the knees more on the way down
Letting the knees bend further as you descend turns the lift into a Romanian or conventional deadlift and takes away the hamstring stretch.
Letting the dumbbells drift forward
Dumbbells that swing away from the legs lengthen the lever on the lower back and pull your weight onto your toes.
Bouncing at the bottom
Dropping fast and rebounding out of the stretch loads the hamstrings abruptly at their longest point.
Leaning back at the top
Arching backward at lockout compresses the lower back, so finish standing tall with the glutes squeezed.
Injuries
Dumbbell Stiff-Leg Deadlift is a medium risk exercise when performed with proper technique. The straight-knee position makes the hamstrings the limit on depth, so the lower back is the most common strain point: once the hamstrings run out of length, any further reach toward the floor comes from the spine rounding under load. The hamstrings themselves are also at risk at the bottom of the rep, where they are stretched and loaded at the same time, especially if you drop quickly or bounce out of the bottom. Pressing the knees back into a hard lockout can also leave the back of the knee uncomfortable.
Let your back position, not the floor, set your depth, and stop each rep just before your lower back starts to round. Lower the dumbbells slowly, keep them close to your legs so the lever on your lower back stays short, and keep a soft bend in the knees. Start light and add weight gradually, since the hamstrings are working at a longer length than in most lower-body exercises.
If you cannot keep a flat back through the range, regress to the Dumbbell Romanian Deadlift, which allows more knee bend, or train the hip extensors with a Hyperextension. Once the pattern is solid, progress to the Barbell Stiff-Leg Deadlift or the single-leg version. Stop the set if you feel a sharp or pulling pain in the back of the thigh, low back pain that spreads into the leg, or numbness or tingling.
- Primary Focus
- Hamstrings and glutes
- Equipment
- Dumbbell
- Modality
- Strength
- Difficulty
- Intermediate
Alternative Exercises
Frequently Asked Questions
- Q: How is this different from a Dumbbell Romanian Deadlift?
The stiff-leg version keeps the knees nearly straight and lowers the dumbbells further, while the Dumbbell Romanian Deadlift bends the knees more, pushes the hips further back and usually stops around mid-shin. In a barbell study of competitive bodybuilders, the straight-knee stiff-leg deadlift produced more gluteus maximus activity on the way up than the Romanian deadlift, while the Romanian deadlift produced more semitendinosus activity.
- Q: Should the dumbbells touch the floor?
Only if you can get there with a flat back. Depth is set by your hamstring length, so for many lifters the right end point is somewhere between mid-shin and the tops of the feet, and reaching further by rounding the back defeats the exercise.
- Q: Should my knees be completely straight?
No. Keep the knees nearly straight with a soft bend that you hold for the whole set, rather than pressing them into a hard lockout. The stiff in the name means the knee angle does not change, not that the joint is locked.
- Q: How heavy should I go?
Most lifters use less weight than on a Romanian deadlift, because the straighter knees and greater depth make the hamstrings work at a longer length. Choose a load you can lower slowly with a flat back for 8 to 12 reps.
- Q: Do I still need leg curls if I do stiff-leg deadlifts?
Usually, yes. In a nine-week trial with untrained adults, stiff-leg deadlift training grew the hamstrings mostly through the semimembranosus, while the Nordic Hamstring Curl grew mostly the semitendinosus, and the authors recommend using both. A knee-bending exercise such as the Machine Seated Leg Curl covers the part of the hamstrings' job that a hip hinge does not.