How is a lateral lunge different from a Cossack squat?

In a lateral lunge you step out, bend one leg to about thigh-parallel with both feet flat, then return to the start. A Cossack Squat stays in a wide stance, sinks much deeper and lets the straight leg's toes turn up toward the ceiling, so it demands more hip and ankle mobility.

How wide should I step?

Wide enough that your trailing leg straightens, but not so wide that your bent shin cannot stay roughly vertical over the foot. If your knee drifts well past your toes or your heel lifts, shorten the step.

Should my toes point forward or out?

Keep both feet pointing forward or turned out only slightly, and let the bent knee follow the direction of its toes. Turning the stepping foot far out changes the movement and makes it harder to keep the knee aligned.

Is the lateral lunge enough to strengthen the groin?

Not on its own. It works the inner thighs through a long range, which makes it a good part of groin-strength work, but it is not a direct adductor exercise; add targeted work such as the Copenhagen Plank or Machine Hip Adduction.

Should I alternate sides or do all reps on one side?

Both work. Alternating gives each leg a short rest and practices stepping out and back, while doing all reps on one side before switching keeps the working leg under tension for longer.

Bodyweight Lateral Lunge

What Is the Bodyweight Lateral Lunge?

Bodyweight Lateral Lunge is a compound exercise that primarily targets the quads and glutes and also engages the inner-thigh adductors, the hamstrings and the smaller hip stabilizers. It is a beginner-level movement that needs no equipment, making it a practical way to train the legs in a direction most lower-body exercises leave out.

Most leg training moves the body forward and back. The lateral lunge steps to the side instead, so one leg bends and takes the load while the other stays straight and the inner thigh lengthens. That makes it a common choice in warm-ups, in lower-body sessions as a single-leg accessory, and in circuits, and a useful one for anyone whose sport or daily life involves shuffling, cutting or stepping sideways.

The bent leg does most of the work: the quads straighten the knee and the glutes and adductor magnus extend the hip as you push back to standing. The straight leg's adductors stretch under tension on the way down and help pull you back to center. Sitting the hips further back and leaning the chest slightly forward shifts more of the work to the glutes, while staying more upright with a deeper knee bend puts more on the quads. The dynamic lateral lunge is different from the Cossack Squat, which goes much deeper and lets the straight leg's toes turn up toward the ceiling, and from the Side Lunge Stretch, which holds the bottom position to stretch the inner thigh rather than moving in and out of it for reps.

The exercise suits beginners, runners and field and court athletes, and anyone who wants stronger, more mobile hips. If you cannot yet control a Bodyweight Squat to a comfortable depth, build that first, then start with a shorter step and a shallower bend. Once full-depth reps feel easy, hold a dumbbell or kettlebell at your chest or slow down the lowering phase to keep progressing.

Muscles Worked

MuscleActivation

Gluteus Maximus: Primary
Vastus Lateralis: Primary
Vastus Medialis: Primary
Adductor Magnus: High
Rectus Femoris: High
Adductor Longus: Medium
Gluteus Medius: Medium
Biceps Femoris: Low
Erector Spinae: Low
Semitendinosus: Low

Instructions

Stand tall with your feet about hip-width apart, toes pointing forward, and clasp your hands in front of your chest.
Brace your core and keep your chest up.
Take a wide step directly out to the side with one foot, landing with the toes pointing forward or turned out slightly.
As the foot lands, push your hips back and bend that knee, shifting your weight onto the stepping leg while the other leg stays straight.
Lower until the bent thigh is about parallel to the floor, or as low as you can keep the heel down, the knee over the toes and the back long.
Keep the straight leg's foot flat on the floor throughout; you should feel a stretch along its inner thigh.
Push through the whole foot of the bent leg to drive back up and bring your feet together again.
Repeat for all reps on one side before switching, or alternate sides with each rep.

Common Mistakes

Letting the knee cave in
The bent knee drifting inside the foot twists the knee joint, so keep it tracking in line with your toes.
Stepping too wide
A step so wide that the shin cannot get over the foot strains the knee and groin, so shorten it until the shin stays close to vertical.
Lifting the heel
Rolling onto the toes of the bent leg shifts stress to the front of the knee and costs balance, so keep the whole foot flat and push through it.
Dropping straight down
Bending only the knee without pushing the hips back drives the knee forward and takes the glutes out of the movement.
Rounding the back
Collapsing the chest toward the floor loads the lower back, so hinge from the hips with a long, braced spine.
Bending the straight leg
Letting the trailing knee bend or its foot roll onto its edge removes the inner-thigh stretch and turns the movement into a shallow squat.

Injuries

Bodyweight Lateral Lunge is a low risk exercise when performed with proper technique. The main strain points are the knee of the bent leg, the inner thigh of the straight leg and, less often, the lower back. Letting the bent knee cave inward, dropping into the bottom too fast or stepping wider than your hips can control are the usual causes of trouble.

The knee takes more load the deeper you bend. A lab study of 16 healthy adults estimated higher kneecap joint force and stress in the bodyweight side lunge than in the forward lunge once the knee bent past about 40 degrees, so anyone with pain at the front of the knee can start with a shallower bend and add depth as it stays comfortable. Choose a step width that lets your shin stay close to vertical with the knee over the toes, lower under control, and keep your back long by hinging from the hips.

To make it easier, shorten the step, reduce the depth or hold a support with one hand, and build base strength with a Bodyweight Squat or a Band Lateral Walk. To progress, hold a dumbbell or kettlebell at your chest, slow the lowering phase, or move on to the deeper Cossack Squat once your hips allow it.

Stop if you feel a sharp or pulling pain in the groin or inner thigh, pain at the front of the knee, or a pinching feeling deep in the front of the hip. A strong stretch along the inner thigh of the straight leg is normal; pain is not.

Overview

Primary Focus: Quads and glutes
Equipment: Body weight
Modality: Strength
Difficulty: Beginner

Alternative Exercises

Frequently Asked Questions

Q: How is a lateral lunge different from a Cossack squat?: In a lateral lunge you step out, bend one leg to about thigh-parallel with both feet flat, then return to the start. A Cossack Squat stays in a wide stance, sinks much deeper and lets the straight leg's toes turn up toward the ceiling, so it demands more hip and ankle mobility.
Q: How wide should I step?: Wide enough that your trailing leg straightens, but not so wide that your bent shin cannot stay roughly vertical over the foot. If your knee drifts well past your toes or your heel lifts, shorten the step.
Q: Should my toes point forward or out?: Keep both feet pointing forward or turned out only slightly, and let the bent knee follow the direction of its toes. Turning the stepping foot far out changes the movement and makes it harder to keep the knee aligned.
Q: Is the lateral lunge enough to strengthen the groin?: Not on its own. It works the inner thighs through a long range, which makes it a good part of groin-strength work, but it is not a direct adductor exercise; add targeted work such as the Copenhagen Plank or Machine Hip Adduction.
Q: Should I alternate sides or do all reps on one side?: Both work. Alternating gives each leg a short rest and practices stepping out and back, while doing all reps on one side before switching keeps the working leg under tension for longer.