yeah i stretch all the time at the top of the lift before first run stretch all the muscles in the leg and get your arms and torso stretched. like billy said it helps once you start getting old too.
you really should stretch before you put your boots on so you can stretch your ankles so you dont hurt your achillies or any of the other tendons in your foot - speaking from experience
dude i stretched before skiing the other day... problly the first time i have.... i could do rockets and truck drivers wayyy easier and buttering was like..... super duper easy. it helps trust me.