Back in the day, stretching was recommended before anything active. And when people recommended stretching, they typically meant static stretching. You have probably done static stretching before, like when you sit down and grasp your toes (or at least try to) for up to 30 seconds. You do this a few times and move on to whatever else is in your routine. Good idea, right? Turns out, not so much.
Recent studies have proven that this old-school technique can actually decrease the effectiveness of your workout.