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I have to agree with most of the rest; two weeks is too soon. You need to give your legs time to recover and revamp your training to figure out why you hit the Wall at 20 miles. You said you had cramps in your calves and quads. Cramps are associated with depletion of glycogen and build up of lactic acid. Try forgeting about times for a while. Work on slowing down the first half of your long run, push it out a little longer, and cross train (weights and bike or swimming) to develop another group of large muscles. That muscle group can help your body metabolize those waste products so that the blunt of the work is not entirely on the muscles you use for running. 4:20 is a great 1st Marathon time! Be proud of yourself. Buzzy
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