Anterior thigh muscles

Quadriceps femoris

Musculus quadriceps femoris

Your front thigh muscles straighten the knee and control your descent when going down stairs, sitting down or lowering into a squat.

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Front view of the human muscular system with the quadriceps highlighted — Front view · front thighs

At a glance

Region: Front thigh
Movement pattern: Knee extension and controlled lowering
Joint: Knee and hip joints

Exercises

Exercises for the quadriceps

Athlete performing a Bulgarian split squat with two dumbbells and the rear foot on a bench.

Two dumbbells and a stable low bench

Bulgarian split squat with dumbbells

A rear-foot-elevated split squat trains the quadriceps and glutes of the front leg while challenging balance.

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Split squat with the front foot flat, rear heel lifted and rear knee close to the floor.

No equipment · Standing

Bodyweight split squat

Bend both knees in a fixed staggered stance. The front leg's quadriceps and glutes work together to raise you again.

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Reverse lunge with one leg stepped back, front foot flat and the rear knee lowered.

No equipment · Standing

Bodyweight reverse lunge

Step backward and lower with control, then return to standing. This trains the quadriceps and glutes with a changing stance.

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Dumbbell

Dumbbell goblet squat

Squat with one dumbbell close to your chest. Your quads work with your glutes and other muscles.

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Start of a step-up with one whole foot on a low platform and the other foot still on the floor behind it.

No equipment · Low stable step

Low step-up

Step onto a low platform, then lower slowly. Train one leading leg at a time.

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Upright person on a flat bench with one knee straightened forward, thigh supported and the other foot on the floor.

No equipment · Chair or bench

Seated knee extension

Straighten one knee while seated. The thigh stays supported as the lower leg rises.

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Controlled barbell squat inside a rack, with the bar on the upper back, heels planted and knees following the toes.

Barbell · Squat rack

Barbell back squat

Squat with a bar across your upper back. Quads and glutes work together.

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Person seated in a horizontal leg press, back supported, both feet flat on the footplate and knees bent.

Machine · Seated leg press

Seated leg press

Press through both feet with your back supported. Quads and glutes share the movement.

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Seated leg extension with supported thighs and a padded roller across the front of the lower shins, just above the ankles.

Machine · Leg extension

Machine leg extension

Straighten both knees against a padded roller to focus on your quads.

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Understand the muscle

Four main parts, one shared tendon

The four main quadriceps muscles join above the kneecap in a common tendon. Force passes through the kneecap and patellar ligament to the shin. The rectus femoris also crosses the hip.

Superficial middle portion

Rectus femoris

Musculus rectus femoris

Runs from the pelvis over the front of the thigh. It helps straighten the knee and lift the thigh forward.

Exercises for this region

Outer quad

Vastus lateralis

Musculus vastus lateralis

The large outer portion starts on the femur and contributes to knee extension through the common quadriceps tendon.

Exercises for this region

Inner quad

Vastus medialis

Musculus vastus medialis

This inner portion is prominent above the knee. It helps extend the knee and contributes to the coordinated guidance of the kneecap.

Exercises for this region

Deep quad

Vastus intermedius

Musculus vastus intermedius

Lies beneath the rectus femoris, directly on the front of the femur. It extends the knee without crossing the hip.

Exercises for this region

The listed exercises involve this region alongside other parts of the muscle. A muscle head or deep portion is not necessarily trained in isolation.

Simply explained

What does the muscle do?

In simple terms, the quadriceps straightens your knee and helps you stand up, squat, climb stairs, run, and jump.

Side view: the lower leg rises from a bent knee (1, dashed) into a straightened position (2, teal), while the thigh stays supported. — Side view · thigh stays supported

Straighten the knee

Knee extension

The lower leg straightens relative to the thigh. All four main parts contribute, as in a seated knee extension or when rising from a squat.

Side view: a straight leg moves from beneath the pelvis (1, dashed) to a forward-raised position (2, teal), with the torso steady. — Side view · rectus femoris assists

Lift the thigh forward

Hip flexion

The rectus femoris assists the other hip flexors when the thigh moves forward. The three vastus muscles act at the knee and do not cross the hip.

Side view: the lower leg descends from the straightened start (1, dashed) toward a bent knee (2, teal), with the thigh supported. — Side view · lower with control

Slow the lowering phase

Eccentric control

The quadriceps also produces force as it lengthens. It controls knee bending when you lower the foot after a seated extension or descend into a squat.

Often works with

Sources & illustrations

Anatomy and technique: the references below. Region boundaries and movement diagrams are schematic. Exercise images are AI-generated illustrations.