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When summer weather really sizzles, remember that marathon training schedules aren't written in stone. If you see that it is going to be up near 100 degrees on a given Saturday, take your planned 16- to 20-mile run down to a 13-miler, bring plenty of water, and do your longer run on the next weekend, or even if you get two bad weeks in a row, two weeks of 13-milers as a long run won't hurt your marathon training, either.
Even if your marathon is in the early fall, if you have been able to get several weeks of 13- to 16-milers for your long runs, you can get in a 20 a few weeks before your marathon and you should be in good shape, whether you are a beginning marathoner or more experienced.
You will have better weeks to get in a few longer runs in the ear