Why Does Your Knee Hurt? Being active makes every part of your body to move and there are particular workouts that put a heavier tension to your knees. You might experience sprained ligaments, back pains and sore muscles in the hip area but the knee is considered to be the crankiest join in the body. When you suffer from mid-workout knee pain, you are not alone. Actually, no one is exempted from feeling like their knees have been bludgeon by a blistering hot iron. So what could be the cause of it? How can you prevent it?