Isometric knee extension performed in sitting with self-resistance from opposite leg throughout full range of motion.
Sit on a chair and keep arms by the side. Keep one foot on the other just above the ankle. Push the under-leg against the resistance of the other leg and straighten the knee. Hold and release the resistance so as to bring the leg to starting position.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.
