Replying to In ski shape?

anyone else get this feeling?

im 23, i skied my first mountain day of the season yesterday at at mount snow, and im wrecked today.  im in decent physical shape, i dont go to the gym or anything, im just in good shape.  i dont stretch or anything before i ski, but im deffinetly gonna start this season, cause today im destroyed.  i skied 140 days last season and barely felt like this ever

question:
anyone whoes been in this situation, what different things did you do that helped?  im deff gonna start stretching regularly even if im not skiing, i think more hydration would help, anyone have any suggestions activity or diet wise?