Quadriceps
Exercises that target the quadriceps, grouped by whether they stretch or strengthen it.
The quadriceps are the four muscles on the front of the thigh: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. Together they straighten the knee and control knee bending under load when you sit down, descend stairs, squat, run, or land. Rectus femoris also crosses the hip and contributes to hip flexion.
Quadriceps capacity matters for comfortable knee extension and for absorbing load, but posture or knee symptoms cannot be explained by this muscle group alone. Hip strength, ankle motion, training volume, movement strategy, and the knee joint itself can all influence how a task feels. A bent-knee resting posture also does not prove that the quadriceps are weak.
Exercises can range from low-load short-arc or terminal knee extensions to step-ups, split squats, and deeper squat patterns. Choose a version that allows controlled alignment and a tolerable effort, then increase range, resistance, or repetitions gradually rather than jumping between levels.
Stretching may be useful when the front of the thigh feels restricted, particularly for rectus femoris, but it should not replace progressive strengthening. Knee swelling, locking, giving way, or worsening pain needs clinical assessment.
