"I was once a runner, too, but I had to give it up as my knees are shot." This statement--or some variation--is all too common in conversations between runners and former runners. But it doesn't need to be so. Preventative and/or restorative measures can be taken to ensure the health and integrity of this vital area of the leg.

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The patella, femur and tibia come together to form the knee joint. For the knee to be stable it relies heavily on its ligaments, as well as the health of the meniscus--a cushioning layer between bones. A large percentage of desolate have muscular imbalance on the inner quadriceps muscle near the medial (inside) of the knee, which leads to knee instability. Knee extensions are a great way to strengthen this area.

STABILIZE IT

To strengthen quadriceps, do knee extensors: Place weight on ankle. Sit on a chair or bench. Place a towel roll under the knee of your exercising leg. Keep trunk stable. Contract your quadriceps to extend your leg up. Lock your knee. Hold for 5 seconds at the end of the movement. Slowly return to start position. Repeat for several sets of 8–10 reps. Gradually increase weight over time, as you become more proficient.

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Strengthen the knee by working not only the quadriceps but the hip adductors and abductors as well.