I did Goofy for the first time, and, it was my first full and only my 2nd half. I did 2 sets of back to backs each week. Midweek, I did short run, medium run back to backs. Weekend, I did medium run, long run back to backs. I did get injured 6 weeks out, but still finished with 1:48 and 4:55, which isn't bad in my opinion. 
