FOR TODAY'S WORKOUT, RUN FOR 40-55 MINUTES: This is one of 2 to 4 sessions you'll do each week to maintain and fine-tune the endurance you develop on your weekly long runs. Your goal in this training program is to run a 3:15 marathon, that is, to do the marathon in 3 hours and 15 minutes. This time goal will guide the speed of your training runs and make sure you don't go too fast. For a 3:15 marathon goal, you'll run each mile in 7 minutes, 26 seconds. These per-mile times are called your "mile splits."
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