Inclining your back touching a wall. While you are in the said position your knees should also be bended at an angle of 90 degrees sliding downward, then again straighten up. Do it smoothly and little by little. Your legs and feet should sustain always be parallel and do it for 5 up to 10 times.
Here are some of Knee Stretches Exercises which will probably help you in maintaining the good condition of your knees:
Extending your knee while seated on a chair. You are relaxing your foot on the chair while your knee is slightly raised. The raised knee will now be push a little bit forward towards the floor using your legs. You are going to hold it for at least 5 to 10 seconds then release. Do it for at least 5 times for each knee.
The first type of knee strengthening exercise is sitting on a chair and your feet flat on the floor. In doing this knee exercise, you must ensure that your thigh is parallel to the floor.
Keep in mind that sitting properly can help the tendons and muscles surrounding your knees to relax and remove the stress that accompany them.
You can put variations in this knee strengthening exercise like pointing your toes, raising your feet above the ground and performing circular motion, or lifting your feet slowly making it parallel to the floor.
It is never too late to shape-up your legs. Strong, shapely legs not only look good in short, skirts and bathing suits; they also make walking, running, swimming, stair climbing, biking and just about anything else you use your legs for, a lot easier.