If you want to crush at cyclocross (or for that matter whatever sport you choose) starting doing crossfit to train for it. You will see huge gains in your performance within a month. Guaranteed.
And speaking of awesome spectator sports if you enjoy seeing people suffer and you are PDX based come by the lab this Saturday at either 8:30 am or 1 pm... we're doing a workout (5 minutes of work, 1 minute of rest, 3 rounds) that will result in at least one person getting introduced to our close friend pukie before it is over. At least one. And we're raising money for prostate cancer research!