RDL Muscles Worked: What a Romanian Deadlift Trains and How to Shift It

The Romanian deadlift works your hamstrings and glutes hardest, with your spinal erectors and the adductor magnus (the big inner thigh muscle that also helps extend your hip) carrying a lot of the supporting load. Your lats, traps and forearms hold the bar in place without moving. Your quads do very little. If you're asking which of the hamstrings and glutes takes more of the work, the honest answer is that it shifts with your range, hip position and knee bend, and this page shows you how to steer it.

This isn't a how-to. For the full step by step technique, head to our Romanian deadlift guide. Here the focus is what's being trained and why.

The muscles an RDL works

The movement is a hip hinge: your hips travel back, your torso tips forward, and your knees stay softly bent and mostly fixed. That one pattern loads a chain of muscles from your upper back to your hamstrings.

• Hamstrings (main mover). Biceps femoris, semitendinosus and semimembranosus cross both the hip and knee. Because your knees barely bend, the hamstrings work almost entirely as hip extensors, and they're lengthened under load at the bottom. That stretched position is why the RDL is such a staple for hamstring size.
• Gluteus maximus (main mover). The glutes drive your hips forward to stand. They work hardest through the middle and top of the lift, and a deliberate squeeze at lockout adds to it.
• Adductor magnus. The rear portion of this inner thigh muscle is a genuine hip extensor, which is why people often feel a deep pull high on the inner thigh at the bottom. It's a quiet contributor, and most lifters never realise it's there.
• Spinal erectors. These muscles along your spine work isometrically to hold your back flat against the pull of the bar. Expect a fatigue in your lower back; you're not meant to feel it as pain.
• Lats, traps and rhomboids. Your lats pin the bar close to your legs, and your upper back holds your shoulder blades set. They don't move through a range, but they're working the whole set.
• Forearms and grip. Your hands carry the whole load for every second of the set. Heavy RDLs are a strong grip builder, and grip often gives out before your hamstrings do.
• Calves. Light stabilising work only.

What the research shows

Surface EMG studies on the RDL are small, and the findings don't all point the same way, so treat them as useful signals rather than gospel.

A 2022 study put ten competitive bodybuilders through Romanian, step-Romanian (standing on a platform for extra range) and stiff-leg deadlifts at 80% of their one-rep max. During the lifting phase, the glute max was more excited in the stiff-leg version than in the standard RDL, while the semitendinosus was more excited in the RDL than in the stiff-leg. Standing on a step raised excitation of the glutes, semitendinosus and a lower back muscle (the longissimus) over both of the others, and the authors pointed to the greater range of motion (Coratella et al., 2022, International Journal of Environmental Research and Public Health). Differences during the lowering phase were smaller.

A 2022 study of 15 trained women compared the RDL with step-ups, hip extensions, kickbacks, Nordics and leg curls at 75% of estimated one-rep max. The Nordic hamstring curl produced the highest biceps femoris activation overall, and the RDL produced less activity in the biceps femoris than the kickback, Nordic or leg curl (Stevens et al., 2022, International Journal of Exercise Science). The takeaway: the RDL isn't the most intense hamstring exercise per rep by this measure, but it does load a much bigger slice of the posterior chain than an isolation curl.

A separate EMG comparison found the hamstring-to-quadriceps activation ratio was highest in the lying leg curl, though the RDL and hip thrust also showed relatively high ratios, and the RDL's lateral-to-medial hamstring balance was more even than the parallel squat's (Veeck et al., 2024, Research in Sports Medicine). In other words, the RDL is hamstring-dominant, not quad-dominant.

Hip-hinge style movements also tend to favour the long hamstrings. A study using both EMG and functional MRI found that a 45 degree hip extension selectively activated the biceps femoris long head, while the Nordic curl leaned on the semitendinosus (Bourne et al., 2017, British Journal of Sports Medicine). The RDL is a hip extension movement too, so it makes sense to pair it with a knee flexion exercise like a leg curl for complete hamstring coverage.

How stance, grip and range shift the emphasis

You can't isolate a muscle with an RDL, but you can nudge the balance.

Range of motion. A deeper hinge stretches your hamstrings more and loads the glutes at the bottom. Stop where your back would start to round; going lower than that just adds spinal flexion, not hamstring work. Lifters with long, flexible hamstrings can go to mid-shin, while stiffer lifters may stop at the knee.

Knee bend. More knee bend (a looser, squattier RDL) shifts the work toward your glutes and quads and shortens the hamstrings. Less bend (closer to a stiff-leg) pushes more load onto your hamstrings and lower back. Our stiff leg deadlift vs RDL page covers when to pick which.

Stance width. A narrow stance, feet around hip width, is the standard. Going a little wider with toes slightly turned out gives your adductor magnus a bigger share. Don't go so wide that you can't keep your shins vertical.

Foot position (staggered or split). Lifting on one leg, or using a staggered "kickstand" foot, loads one side harder, reduces total weight and demands more balance. Our B-stance RDL guide walks through that variation.

Grip. A double overhand grip, hands just outside your thighs, is plenty. A wider grip can slightly increase upper back tension, but changing grip width isn't a lever worth fussing over compared to your hip and knee position. Use straps if grip is cutting your sets short, because an exhausted grip stops you training your hamstrings hard.

Bar path. Keep the bar dragging along your thighs and shins. If it floats forward, your lower back takes the load and your hamstrings lose it.

RDL vs conventional deadlift vs stiff-leg deadlift

	RDL	Conventional deadlift	Stiff-leg deadlift
Start position	Standing, bar lowered	Floor, bar pulled up	Standing, bar lowered
Knee bend	Soft, fixed	Large, changes through the rep	Minimal
Hamstrings	High, constant tension	Moderate	Very high
Glutes	High	High	High
Quads	Low	Moderate to high	Low
Lower back	High, isometric	High	Very high
Best use	Hamstring and glute size	Overall strength	Hamstring stretch with less load

The conventional deadlift starts from the floor and puts your quads to work early, so it's a squat and a hinge combined. You can handle the most weight there, but your hamstrings get less time under tension. The stiff-leg deadlift is the most hamstring and lower back heavy of the three, but it's less forgiving for anyone with tight hamstrings. The RDL sits in the middle and is the most useful all-rounder for building the back of your legs.

How to feel your hamstrings in the RDL

If your lower back or glutes take over, work through this checklist.

1. Push your hips back, not down. Imagine closing a car door behind you with your backside.
2. Slow the lowering. Take three seconds down, so the hamstrings control the stretch instead of the bar dropping.
3. Keep your shins near vertical. If your knees drift forward, it becomes a squat.
4. Lower only until you feel a firm hamstring stretch. Stop before your back rounds.
5. Squeeze your glutes to stand. Think about pulling the floor back with your feet, not yanking the bar up with your back.
6. Drop the weight. A load you can control for 8 to 12 reps will teach the feeling better than a heavy grind.

Barbells give you the best loading progression for this lift (our best barbell guide covers what to buy), though a pair of dumbbells works just as well when you're learning the pattern.

Where the RDL fits in a programme

Use it as your main hamstring and glute builder once or twice a week for 3 to 4 sets of 6 to 12 reps. Pair it with a knee flexion move like a leg curl, a quad exercise like a squat, and a lockout movement like a hip thrust. Browse more ideas on our workouts hub.

Recommended reads

• Romanian deadlift: how to do it, muscles worked and benefits
• Stiff leg deadlift vs RDL
• B-stance RDL
• Best barbell UK
• Workouts