I'm looking for a training plan that someone has used and had success with. I've run 6 previous marathons and have trained using Jack Daniels, Hal Higdon, and maybe one other plan. I've hit the wall hard around mile 18-19 no matter what plan I use. I'm old and slow (run about a 4 hour marathon), but I wanted to try something different for the Memphis St. Jude. Any suggestions would be appreciated.