Seated Single Leg Knee Extension (VERSION 2)
- Músculo objetivo
- —
- Equipamiento
- Body weight
- Parte del cuerpo
- Thighs
- Tipo
- Strength
The seated single leg knee extension (version 2) is a bodyweight exercise performed on a chair or bench that targets the quadriceps of one leg at a time. By extending the knee through its full range of motion without a machine, it strengthens the thighs while also challenging balance and unilateral muscle control. It is well suited for beginners, rehabilitation settings, or anyone training without gym equipment.
Cómo hacer el Seated Single Leg Knee Extension (VERSION 2)
- 1Sit upright on a sturdy chair or bench with your feet flat on the floor and your back away from the backrest.
- 2Place your hands on the sides of the seat or on your thighs for light support.
- 3Lift one foot slightly off the floor so the working leg hangs freely.
- 4Brace your core and sit tall with a neutral spine throughout the movement.
- 5Slowly straighten the working leg by extending the knee until the leg is nearly parallel to the floor.
- 6Pause briefly at the top, squeezing the quadriceps.
- 7Lower the foot back toward the floor in a controlled manner, stopping just before it touches.
- 8Complete all reps on one side before switching to the other leg.
Consejos de técnica
- Move only at the knee — keep the thigh stationary and avoid rocking the hips or torso to generate momentum.
- Flex the foot (toes toward you) at the top of the movement to increase quadriceps engagement.
- Control the lowering phase for at least two counts; resisting gravity builds as much strength as lifting against it.
- Sit toward the front edge of the seat so the back of the thigh does not press into the chair, which can restrict range of motion.
- Breathe out as you extend the leg and breathe in as you lower it.
Errores comunes
- Using momentum by swinging the torso: leaning back or rocking forward shifts load away from the quadriceps and reduces the effectiveness of each repetition.
- Not fully extending the knee: stopping short of full extension limits the range of motion and fails to work the quadriceps through their complete length.
- Lowering the foot too quickly: dropping the leg rapidly removes time under tension and reduces the training stimulus for the thigh muscles.
- Allowing the hip to hike or rotate: lifting the hip to help raise the leg introduces compensations that shift stress away from the target muscles.
- Gripping the seat too hard and pulling upward: using arm strength to assist the movement reduces the demand placed on the quadriceps.
Preguntas frecuentes
What muscles does the seated single leg knee extension work?
The exercise primarily targets the quadriceps — the group of four muscles on the front of the thigh — which are responsible for extending the knee. Because no additional equipment or resistance is used, the load is limited to the weight of the lower leg itself.
How is this version different from a seated knee extension on a machine?
On a machine, padded resistance is placed across the shin and the load increases throughout the range of motion. This bodyweight version relies solely on the weight of the lower leg, making it less intense but accessible anywhere, requiring only a chair or bench.
Is the seated single leg knee extension good for knee rehabilitation?
Bodyweight knee extensions on a chair are commonly used in early-stage rehabilitation because the load is very low and easily controlled. However, anyone recovering from a knee injury should consult a physical therapist before starting, as the appropriate exercise and range of motion will depend on the specific condition.
How many reps and sets should I do?
For general strength and endurance, two to three sets of 15 to 20 repetitions per leg is a reasonable starting point. Progress by slowing the tempo, adding a longer pause at full extension, or eventually moving to a weighted version of the exercise.
Can I make this exercise harder without equipment?
Yes. You can increase difficulty by slowing the lowering phase to three to five counts, adding a two-second pause at full extension, performing more repetitions per set, or attaching a light resistance band just above the ankle to increase the load on the quadriceps.
