There is still a common misconception out there that it is very important to stretch before you run or play a game of sport. While it might sound crazy to you, I am suggesting to you that you stop it. Static stretching to increase your flexibility is an extremely important part of your health care regime and everyone should be stretching multiple times a week, if not every day. What's most important though is the timing of it. When you stretch, you are lengthening your muscles and other soft tissues, so after stretching you're joints are actually vulnerable to injury for approximately 90 minutes. So you need to stretch either after a workout, or ideally when you are relaxing at home and not planning on following the stretching session with a workout. However, I am also not suggesting you start a run or a workout cold, otherwise you will create even more injuries than of you stretch. Instead, what you need is a dynamic warmup. Getting the blood pumping through all of you...
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