I keep on posting things like this, but the studies keep on coming. Here is another one which says that :
static stretching may not be recommended before athletic events or physical activities that require high levels of force. On the other hand, ballistic stretching could be more appropriate because it seems less likely to decrease maximal strength.Acute Effect of a Ballistic and a Static Stretching Exercise Bout on Flexibility and Maximal Strength.
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I'll see if I can track down that clip. The "stretching issue" is just one part of an overall very interesting clip.