It all comes down to this: Tomorrow morning, I embark for the first time ever on a 26.2 mile running journey ending, hopefully, in great satisfaction and personal accomplishment. This is the culmination of nearly four months of training. Two days ago, I ran 3 miles and thus completed the pre-marathon portion of the training program. Since December 29th, I have completed 64 runs, ranging from 2 miles to 20 miles. Over nearly 65 hours of running, I ran 435 miles. The 3-miler was the final run of nearly three…