Basically once you are "in shape," training to run a half marathon - my next race - involves a 14 week program, which starts Tuesday. One week includes two days of rest, two days of cross-training, two days of shorter distances (that increase as the weeks progress) and one day of long distance (which also increase).
Today, I used the elliptical for 40 minutes - alternating between less resistance with high incline and more resistance with low incline. I'm excited to start the 14 week program this week. It's supposed to be under 70 degress! Woo hoo!