Muscle guide · Thighs
Also called quads, front thigh muscles
The quadriceps are the four large muscles on the front of the thigh, together the most voluminous muscle group in the body. Their tendons merge around the kneecap and continue as the patellar tendon to the bump below the knee.
They straighten the knee, which is what lets you stand up, climb stairs and kick, and they brake the knee as you land, walk downhill or go down steps. One of them, the rectus femoris, also crosses the hip.
| Part | Starts at | Attaches to | What it does |
|---|---|---|---|
| Rectus femoris | Front of the pelvis just above the hip socket | Kneecap, then the bump below the knee via the patellar tendon | Straightens the knee and bends the hip; the only quad that crosses the hip |
| Vastus lateralis | Outer upper thigh bone | Outer kneecap and quadriceps tendon | Straightens the knee; the largest share, about 40% of quad strength |
| Vastus medialis | Inner side of the thigh bone | Quadriceps tendon and kneecap | Straightens the knee; about 25% of quad strength, with a modest direct pull on the kneecap |
| Vastus intermedius | Front of the thigh bone, under the rectus femoris | Top of the kneecap | Straightens the knee |
For patellar tendon pain, isometric holds, heavy slow resistance (squats, leg press) and eccentric decline squats are all effective; isometric and heavy slow programmes did better than eccentric training alone.
3D demoBarbell back squatAdvanced · A barbell
3D demoLeg pressBeginner · Strength machine
3D demoSpanish squat (band squat hold)Intermediate · A band + An anchor point
3D demoWall sitBeginner · A wall
3D demoLeg extensionBeginner · Strength machine
3D demoRear-foot-elevated split squat (Bulgarian split squat)Intermediate · A bench or box
3D demoHeel-elevated deep squat (slant board squat)Intermediate · A step
3D demoReverse NordicAdvanced · No equipmentPull the heel toward the buttock with the hip straight or behind you; extending the hip adds the rectus femoris, which crosses it.
Load-related pain at the patellar tendon, usually just below the kneecap, common in jumping sports. It is a degenerative tendon problem, not an inflammation, so treatment centres on progressive loading, and steroid injections are advised against.
Source 4
Patellofemoral pain often follows a jump in training load. Combining knee and hip exercises is described as the most effective treatment.
Source 5
The rectus femoris is the most often injured quad because it sits at the surface and crosses two joints; kicking and sprinting are the usual causes.
Source 2
Each grade rates the evidence for the correction.
Changing foot position or adding a squeeze did not preferentially activate the vastus medialis in a review of 20 EMG studies, and in a randomised trial VMO-targeted training and ordinary quadriceps strengthening helped kneecap pain equally.
A gym leg day: back squats, leg press, leg curls, Bulgarian split squats, leg extensions and calf raises.
55 minIntermediate9 movesA wall, A barbellA gym lower body workout for legs and glutes: trap bar deadlifts, hip thrusts, reverse lunges, leg curls, hip abduction, calf raises and core.
50 minIntermediate13 movesOther / check instructions, A barbellA lower body workout at home: split squats, slider hamstring curls, single-leg bridges, step-ups, band walks and calf raises, with dumbbell options.
30 minIntermediate12 movesA wall, A stepThe rectus femoris, vastus lateralis, vastus medialis and vastus intermedius.
They straighten the knee, as when you stand up, climb stairs or kick, and they control the knee as you land or go downhill. The rectus femoris also bends the hip.
No special VMO exercise has been shown to isolate it, and general quadriceps strengthening helped kneecap pain as much as VMO-targeted training in a trial.
The vastus lateralis, on the outer thigh, is reported to provide about 40% of quadriceps strength.
Anatomy and movement education, not a diagnosis or treatment plan. If you have pain that follows an injury, is severe or getting worse, or comes with numbness, weakness or swelling, get it assessed. Health disclaimer.
