I always had thought stretching prior to explosive work out put is not prudent. Studies are confirming my way of thinking:

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LaRoche DP et al (2008) of Department of Kinesiology, University of New Hampshire, Durham, New Hampshire, USA. dain.laroche@unh.edu did a study was to determine whether muscle force, power, and optimal length were affected by 4 weeks of static or ballistic stretching.
The study suggested:
1. Individuals can routinely stretch following exercise to maintain flexibility but should avoid stretching prior to exercise requiring high levels of muscle force.
2. Before exercise that requires high muscular forces, individuals may perform dynamic, sport-specific exercises to increase blood flow, metabolic activity, temperature, and compliance of the muscle.

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