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Is Flexibility Overrated?When sorting out all the research on stretching and flexibility for athletes, it's important to remember that the goal of stretching is to develop and maintain an appropriate range of motion around specific joints. It's also important to realize that stretching (or releasing) tight muscles should go hand in hand with strengthening the weak muscles.

I'm sure we'll continue to see headlines for and against stretching, but if you choose to stretch, it may be best to customize your routine to fit your needs. Assess your body and your sport and make sure you stretch (and strengthen) in order to reduce muscle imbalances.

How To StretchAfter exercise, cool down and hold a given stretch only until you feel a slight pulling in the muscle, but no pain. As you hold the stretch the muscle will relax. As you feel less tension you can increase the stretch again until you feel the same slight pull. Hold this position until you feel no further increase.
If you do not seem to gain any range of motion using the above technique, you may consider holding the stretch longer (up to 60 seconds).
What Stretch is Best?
In general, Proprioceptive Neuromuscular Facilitation (PNF) stretching has resulted in greater increases in range of motion compared with static or ballistic stretching, though some results have not been statistically significant.
Static stretches are a bit easier to do and appear to have good results. Studies indicate that continuous stretching without rest may be better than cyclic stretching (applying a stretch, relaxing, and reapplying the stretch), however some research shows no difference.
Most experts believe ballistic, or bouncing during a stretch, is dangerous because the muscle may reflexively contract if restretched quickly following a short relaxation period. Such eccentric contractions are believed to increase the risk of injury.
In addition to improving range of motion, stretching is extremely relaxing and most athletes use stretching exercises to maintain a balance in body mechanics. But one of the biggest benefits of stretching may be something the research can't quantify: it just feels good.

Source

Herbert RD, de Noronha M. Stretching to prevent or reduce muscle soreness after exercise. Cochrane Database of Systematic Reviews 2007, Issue 4.

Andersen, J. C. Stretching Before and After Exercise: Effect on Muscle Soreness and Injury Risk. Journal of Athletic Training 40(2005): 218-220

Witvrouw, Erik, Nele Mahieu, Lieven Danneels, and Peter McNair. Stretching and Injury Prevention An Obscure Relationship. Sports Medicine 34.7(2004): 443-449

Ian Shrier MD, PhD and Kav Gossal MD. The Myths and Truths of Stretching: Individualized Recommendations for Healthy Muscles, The Physician and Sportsmedicine, VOL 28, #8, August 2000.

Trehearn TL, Buresh RJ.. Sit-and-reach flexibility and running economy of men and women collegiate distance runners. J Strength Cond Res. 2009 Jan;23(1):158-62.

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