Anyone who's ever suffered from knee pain can attest to how debilitating it can be. Your knees play a huge part in your mobility, but, according to estimates from the Center for Disease Control, half of all Americans will have arthritis in their knees by the age of 85. My knees are still ok, but I'm not a teenager anymore and I've definitely heard them creaking once or twice. I also know plenty of family members with knee pain. Thankfully, this simple stretching technique can help ease knee pain and protect your knees.