Stretching cold muscles is not only of no use, it actually increases post exercise muscle pain and injury rates. The “weekend warriors” amongst us can frequently be seen hopping out of the car pitch-side for the 5-a-side, doing some vigorous arm spins, lunges and neck rolls – then throwing ourselves head long into the first tackle. The result is an (avoidable) injury.
Those in the know warm up with light jogging for five to ten minutes before doing any stretching – it increases muscle blood flow and elasticity. And reduces injury. For the evidence see UK PubMed Central.