that's a terrible idea. lexapro takes like a month+ to really start to "work", so unless you want to pop pills everyday, then it's not going to help your problem. if you need to calm your nerves, smoke a joint, pop a bar, pound a few beers, do something that is going to have a more instantaneous effect.
i dunno though, the "anxiety" i get before huckin' my meat is what makes skiing dope imo...right after you do it....shit's a rush.