What is Adductors?

What is Adductors?

The adductors are a group of five muscles filling the inner thigh whose shared job is adduction, pulling the leg back toward the midline of the body. The largest by far is the adductor magnus, a big triangular muscle that behaves almost like two muscles in one: its main adductor portion works with the group, while its posterior, or hamstring, part contributes powerfully to hip extension and is even innervated in part by the sciatic nerve rather than the obturator nerve like the rest. Above and in front of it sit the adductor longus and adductor brevis, shorter fan-shaped muscles that adduct and assist hip flexion. The gracilis is the most superficial and the only adductor to cross both the hip and the knee, so it adducts the hip and helps flex the knee. The pectineus, high on the inner thigh, both adducts and flexes and is often grouped with the hip flexors as well. Although people think of the adductors as leg-crossing muscles, their real importance is control and stability. They fine-tune the position of the thigh during walking, running, and cutting, resist the leg being forced outward, and share frontal-plane control of the pelvis with the abductors on the outside of the hip. The adductor magnus in particular is a serious contributor to hip extension in squats and deadlifts, which is why the inner thigh is far more involved in heavy lower-body lifting than most lifters assume. For athletes in sports with rapid changes of direction, the adductors are also a common site of groin strain, so training them for strength through range is as much about injury prevention as performance.

How it works

The adductor muscles originate along the pubis and ischium at the front and bottom of the pelvis and fan downward to attach along the inner shaft of the femur. The adductor magnus is the standout: it arises from the ischiopubic ramus and the ischial tuberosity and inserts along a long line down the femur, ending at the adductor tubercle. Because part of it originates from the ischial tuberosity like the hamstrings and runs to the lower femur, its posterior fibres pull the thigh backward into extension, while its anterior fibres draw the leg toward the midline. This dual line of pull is why electromyography and modelling studies show the adductor magnus producing large hip-extension forces during squats, deadlifts, and other loaded hip-extension tasks, not just during pure adduction. The adductor longus, brevis, gracilis, and pectineus run more directly from the pubis to the femur or, in the gracilis's case, past the knee, so they primarily adduct and, depending on hip angle, assist flexion. When the foot is planted, the adductors act as stabilisers, resisting the thigh being driven outward and helping steer the leg through changes of direction. Most of the group is supplied by the obturator nerve carrying roots L2 to L4, with the hamstring part of the magnus supplied by the tibial division of the sciatic nerve and the pectineus often receiving a femoral branch. For training, this means the adductors respond to two distinct stimuli. Loaded hip extension through a full range, such as deep squats, wide-stance sumo work, and hinges, heavily involves the adductor magnus as a hip extensor. Direct adduction work, such as the Copenhagen adduction exercise, cable adductions, and machine adductions, targets the group as pure adductors and builds the eccentric strength that protects the groin. Research on athletes shows that eccentric adduction training, particularly the Copenhagen exercise, improves adductor strength and is used to reduce groin-injury risk in sports that demand sprinting and cutting. Training both patterns, wide-stance loaded extension plus dedicated adduction, develops the inner thigh fully and keeps the abductor-to-adductor balance that a stable, healthy hip depends on. It is worth appreciating just how much the adductor magnus contributes on the big lifts. Because its posterior fibres share both an origin and a function with the hamstrings, biomechanical models place its hip-extension force alongside the glutes and hamstrings rather than treating the inner thigh as a minor player. That is why lifters who move to a wider stance often feel their squat or deadlift shift toward the inner thigh, and why neglecting the adductors can quietly cap lower-body strength. Direction-specific studies also show the muscle is not uniform: its upper and lower portions can be recruited differently depending on the task, so training the group through varied stances and ranges gives the most complete development.

How to apply it

• Load wide-stance squats and hinges: Sumo squats, sumo deadlifts, and wide-stance hinges bias the adductor magnus as a hip extensor and load it through a long range. Train 6 to 12 reps and reach real depth so the inner thigh works while lengthened.
• Add the Copenhagen adduction exercise: This side-plank variation with the top leg supported builds eccentric adductor strength and is widely used to cut groin-injury risk in cutting sports. Start with short levers and few reps, then progress the lever length and volume gradually.
• Use direct adduction work: Cable adductions, the adductor machine, and banded adductions isolate the group for targeted volume. Use 12 to 20 controlled reps with a pause at the fully adducted position, keeping the movement smooth rather than swinging the leg in.
• Train through a full range: Let the working leg travel out into abduction before pulling it back, so the adductors load in a stretched position. Partial, short-range adductions build far less strength than reps that use the muscle's full length under control.
• Balance with abductor work: The adductors and abductors share frontal-plane control of the hip and pelvis. Pair inner-thigh work with gluteus medius and minimus training so neither side dominates, which supports knee tracking and reduces lateral-hip and groin strain.
• Progress eccentrics carefully: The adductors are a common strain site, so build slowly. Emphasise the lowering phase, add load or lever length only when current sessions feel controlled, and back off if you feel any sharp groin pull rather than pushing through it.

Types

Worked example

A complete adductor block pairs loaded, wide-stance hip extension, which drives the adductor magnus, with a dedicated eccentric groin exercise and some direct isolation. This covers the inner thigh both as a hip extensor and as a pure adductor, building strength and protecting against groin strain.

Reach real depth on the sumo work and use the full adduction range on the isolation. Progress the Copenhagen lever length slowly, and stop any set if you feel a sharp groin pull rather than working through it.

Adductors vs abductors

These antagonists co-manage the hip in the frontal plane. Balanced adductor and abductor strength stabilises the pelvis and knee and lowers the risk of groin strains and lateral-hip pain in running and cutting sports.

By goal

• Strength and powerlifting: The adductor magnus is a major hip extensor, so wide-stance sumo squats and deadlifts build both strength and inner-thigh size. Train them heavy through full depth, and add direct adduction to shore up a stance that feels unstable.
• Cutting and field-sport athletes: Groin strains are common where sprinting and rapid direction changes load the adductors eccentrically. The Copenhagen adduction exercise builds eccentric strength and is used to reduce that risk, so include it year-round, progressing slowly.
• Physique and general lifters: For inner-thigh development, combine wide-stance squats with 12 to 20 rep cable or machine adductions through a full range. Balance it with abductor and glute work so the whole hip stays strong and stable, not just one side.

Common misconceptions

• "The adductors only pull the legs together." Pure adduction is one role, but the adductor magnus is also a major hip extensor in squats and deadlifts, and the group stabilises the thigh and pelvis during walking, running, and cutting. The inner thigh does far more than cross the legs.
• "Inner-thigh machines are a waste of time." The adduction machine and cable adductions isolate the group effectively for targeted volume and rehab. They pair well with wide-stance squats and eccentric drills like the Copenhagen exercise, which train the adductors in their extension and stabilising roles.
• "You can spot-reduce fat from the inner thighs." Adductor exercises build and strengthen the muscle but do not selectively burn the fat over it. A firmer, more developed inner thigh comes from training the muscle plus overall fat loss through an energy deficit, not from local fat burning.
• "Groin strains just need rest." Rest calms an acute strain, but weak adductors tend to be re-injured. Progressive strengthening, especially eccentric work like the Copenhagen adduction exercise, builds the strength through range that makes the groin more resilient to sprinting and cutting.

Related terms

Adductors FAQ

What are the adductor muscles?

The hip adductors are the inner-thigh muscles: the adductor magnus, adductor longus, adductor brevis, gracilis, and pectineus. The adductor magnus is the largest and also acts as a powerful hip extensor, while the gracilis is the only one crossing the knee.

What do the adductors do?

They pull the leg toward the body's midline and stabilise the thigh and pelvis during walking, running, and cutting. The adductor magnus additionally contributes strongly to hip extension in squats and deadlifts, so the inner thigh helps drive heavy lower-body lifts.

How do I train my adductors?

Combine wide-stance squats and sumo deadlifts, which load the adductor magnus in extension, with direct work like cable or machine adductions at 12 to 20 reps, and add the Copenhagen adduction exercise for eccentric strength and groin protection.

What is the Copenhagen adduction exercise?

It is a side-plank variation where the top leg is supported on a bench or partner while you lift and lower the bottom leg, loading the adductors eccentrically. Research in athletes shows it builds adductor strength and is used to reduce groin-injury risk.

Do squats work the adductors?

Yes, especially wide-stance and deep squats. The adductor magnus is a major hip extensor, so it contributes significantly to standing up out of a squat. Sumo squats and sumo deadlifts emphasise the inner thigh more than a narrow stance does.

Why do athletes get groin strains?

Sprinting and rapid direction changes load the adductors eccentrically as they decelerate and control the leg. Weak or fatigued adductors are more likely to strain. Progressive eccentric strengthening, such as the Copenhagen exercise, helps make the groin more resilient.

What nerve controls the adductors?

Most of the adductor group is supplied by the obturator nerve, carrying roots L2 to L4. The posterior hamstring part of the adductor magnus is supplied by the tibial division of the sciatic nerve, and the pectineus often receives a femoral branch.

Should I balance adductor and abductor training?

Yes. The adductors and abductors share frontal-plane control of the hip and pelvis, so training only one side can leave the hip unstable. Pairing inner-thigh work with gluteus medius and minimus training supports knee tracking and reduces strain.

References

1. Anatomy, Bony Pelvis and Lower Limb: Thigh Adductor Magnus Muscle. StatPearls, NCBI Bookshelf
2. Hip Adductor Muscle Forces During Strength Training and Rehabilitation Exercises. Med Sci Sports Exerc, 2026. PubMed 41931009
3. Comparison of hip extensor muscle activity including the adductor magnus during three prone hip extension exercises. Physiother Theory Pract, 2019. PubMed 29601221
4. Adductor magnus: An EMG investigation into proximal and distal portions and direction specific action. Clin Anat, 2018. PubMed 29520841
5. Early strength gains in eccentric hip adduction and adduction-to-abduction ratio following an 8-week Copenhagen Adduction Exercise in elite adolescent taekwondo athletes. J Bodyw Mov Ther, 2025. PubMed 41316591