You feel a grinding in your knees as you pedal; later, they swell and ache.
Here's why: Overuse, improper motion while pedaling, and incorrect seat height all can cause inflammation of your knees.
Feel better: The key to knee health is strong quads. Strengthen these muscles by doing wall squats with your knees bent 60 degrees or leg presses on a machine. Also, dial back your workouts by 20 percent; if you're Spinning, use a lower gear and higher rpm.
Your new game plan: Check your form. Your foot should pedal pointing forward; rotating inward can aggravate the band of tissue on the side of your leg by causing it to rub against the outside of the knee joint.
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