Seated Alternate Knee Extension On Chair

Muscles worked

Setup

1. Sit upright on a sturdy chair with your feet flat on the floor and hip-width apart.
2. Position yourself so your knees are at a 90-degree angle at the edge of the seat.
3. Grip the sides of the chair lightly to stabilize your torso and keep your spine neutral.

How to do it

1. Exhale as you slowly extend one leg forward until it is fully straight and parallel to the floor.
2. Squeeze your quadriceps at the top of the movement for a one-second pause.
3. Inhale as you lower the leg back to the starting position with a controlled 2-second tempo.
4. Alternate by repeating the same movement with the opposite leg.

Form checklist

• Keep your back straight and avoid leaning backward as you lift the leg.
• Ensure the movement is driven by the knee joint only, keeping the hips still.
• Maintain a slow, controlled pace rather than using momentum to swing the leg.
• Keep your toes pointed upward to maximize muscle engagement.

Pro tips

• Focus on the mind-muscle connection by visualizing the quadriceps shortening as the leg straightens.
• For maximum activation, hold the peak contraction at the top until you feel a slight burn in the thigh.

Make it harder

• Wear ankle weights to increase resistance against the quadriceps.
• Perform the exercise with a 5-second isometric hold at the top of every repetition.

Frequently asked

What muscles does the seated alternate knee extension on chair work?

The seated alternate knee extension on chair primarily targets the quadriceps, and also works the obliques as secondary muscles.

What equipment do you need for the seated alternate knee extension on chair?

The seated alternate knee extension on chair requires no equipment — just your body weight.

Is the seated alternate knee extension on chair good for beginners?

Yes. The seated alternate knee extension on chair is a beginner-friendly movement and a strong foundation to build on.

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