The short answer is, don't!
One of the more dangerous (in training terms, not life or death terms) things athletes do is try and make up for missed training sessions. If you have x planned for one day and y planned for the next, doing x+y on the second day does not equal the two successive days of training. The reason is the compounding effect of training in terms of stress.
For many racers who have done a 1/2 marathon and a full marathon know, that marathon was more than 2 times as difficult/stressful as the 1/2. Imagine this scenario, would you rather run a 1/2 marathon 10 days in a row, or run 5 marathons, one every other day for 10 days? I suspect you would choose #1.
So let's take a look at my weekend. Life took over, I had a great time rooting for OC athletes on Saturday and had a great day yesterday. No training, no problem. Get back to consistency tomorrow and continue the progress made this off-season. What I won't do is try and do the mileage I may have missed the last few days.
Slow and steady wins the race. Lot's of baby steps is faster than a giant leap off a cliff.
