Quad Sets

Sit or lie down on a firm bed with your affected leg straight. Place a small, rolled-up towel under your knee. Bend your other leg, with that foot flat on the bed.

Tighten the thigh muscles of your straight leg by pressing the back of your knee down into the towel.

Hold for about 6 seconds, then rest for up to 10 seconds.

Repeat 8 to 12 times.

Switch legs, and repeat steps 1 through 4.