STRAIGHT LEG RAISES FOR YOUR QUADRICEPS
Lie on your back with the leg you are going to exercise straight. Bend your other knee and rest that foot on the floor next to your straight leg. Tighten the quadriceps muscles of your straight leg and lift the leg 12 in. (32 cm) to 18 in. (46 cm) off the floor, hold it for 5 seconds, then slowly lower the leg back down and rest a few seconds.
Do 8 to 12 repetitions, 3 times a day. Your physical therapist may have you add light ankle weights as you become stronger.