Adductor Exercises: Direct Inner-Thigh Training Guide

Squats and lunges load the adductors mostly as synergists that help control the knee and hip in the sagittal plane, not as the prime mover; direct frontal-plane adduction training is a distinct addition for groin-strain resistance and lateral-movement strength, not something a squat-and-lunge programme automatically covers. This guide is not another list of squat variations that happen to involve the inner thigh. It covers the machine, closed-chain, and no-equipment exercises that actually load the adductors as the primary mover, and the evidence behind why direct adductor work matters for change-of-direction athletes and heavy sumo lifters specifically.

Adductor Exercises at a Glance

Why Squats and Lunges Are Not Enough

The adductor group brings the thigh toward the body’s midline, which is a frontal-plane action. A back squat, front squat, or forward lunge is primarily a sagittal-plane movement: the knee and hip flex and extend in the plane running front to back, and the adductors contribute mainly by helping stabilize the knee and control femoral position rather than by producing the movement itself. This is why a lifter can squat heavy for years and still have comparatively weak, undertrained adductors in the specific frontal-plane action that a groin strain occurs in. The lateral lunge is a partial exception, since it does move through a frontal-plane step, giving the adductors a more direct loading role than a standard forward lunge, but it is still a compound, balance-heavy movement rather than an isolated adductor exercise.

Groin-Strain Resistance: What the Evidence Supports

Groin strains, particularly adductor-related groin pain, are a recurring injury in sports involving sprinting, cutting, and kicking. A randomized trial of active physical training, including progressive adductor strengthening, for athletes with long-standing adductor-related groin pain found meaningfully better outcomes in the active-training group compared with a passive-treatment comparison group, supporting structured adductor strengthening as part of managing this injury.¹ Separately, the Copenhagen adduction exercise, a closed-chain, side-plank-like movement that loads the adductors eccentrically, has been studied specifically for its association with groin injury rates in athlete populations; a systematic review of that evidence found support for the exercise’s role in strengthening the adductors and a plausible link to reduced groin problems, while also noting the evidence base has real limitations in study size and design.² Treat this as injury-risk-relevant evidence, not a guarantee: no single exercise eliminates strain risk, and this guide is training education, not a treatment plan for an existing groin injury.

Copenhagen Plank

Support one shin or foot on an elevated surface, such as a bench, with your body in a straight side-plank line and the top leg’s adductors doing the work of holding the position against gravity. Lower the hips slightly, then lift back to the straight line. The eccentric, or lowering, phase is where much of this exercise’s demand is concentrated, which is consistent with the eccentric-strength emphasis linked to strain resistance in the sports-medicine literature above. Start with a bent-knee, partial-range version and progress toward a full straight-leg version as control improves; this is a demanding exercise and should be added gradually rather than performed at full range and volume immediately.

Open-Chain Options: Machine and Cable

The hip adduction machine is the most direct, lowest-balance-demand way to load the adductors through a controlled range, and its own exercise guide covers seat setup and start-range calibration in detail. A cable hip adduction, using an ankle strap anchored to a low or mid pulley, gives a similar open-chain loading pattern with more control over the resistance angle and is a reasonable substitute when a dedicated adduction machine is not available.

No-Machine and Home Options

A resistance band anchored at ankle height, looped around the working ankle, lets you perform standing adduction by pulling the leg across the body’s midline against the band’s tension; this is a practical option for home training or travel. A side-lying leg lift, performed lying on your side with the bottom leg lifted toward the top leg while the top leg is bent and supported in front, trains the same adduction action with only bodyweight resistance. Neither replaces the loading ceiling of a machine or cable, but both give a genuine frontal-plane training stimulus without equipment.

Building an Adductor Programme

For general strengthening, 2-3 sets of 10-15 controlled repetitions per exercise, two to three times per week, is a reasonable starting structure, whether you are using the machine, cable, band, or bodyweight version. If groin-strain resistance is a specific goal, for example in change-of-direction sports, add the Copenhagen plank progressively, starting with a partial-range, bent-knee version for 2-3 sets of 6-10 reps before advancing range or leverage. Pair adductor work with your existing lower-body training; it fits well alongside glute exercises and quad exercises on a lower-body day rather than requiring a dedicated session.

Common Mistakes

The most common mistake is assuming squats and lunges already cover the adductors, which leaves this frontal-plane muscle group without any direct training stimulus. A second error is progressing the Copenhagen plank too quickly to a full straight-leg range before the partial-range version is controlled, which increases the demand faster than the tissue is prepared for. A third is neglecting the eccentric, lowering phase on machine or cable adduction, rushing the return instead of controlling it, which reduces the training stimulus most linked to strain resistance.

If groin or inner-thigh training causes sharp pain, a sudden pulling sensation, or persistent swelling, stop and seek qualified clinical advice rather than continuing to train through it. This guide is training education for strengthening and injury-risk reduction, not a diagnosis or treatment for an existing groin injury.