Yasso 800s

I didn't get my two workouts in today as planned, but I managed to get yesterday's workout in today. Total 7 miles. I did 8 Yasso 800s. What are these? Basically, you take you goal marathon time, mine being 3:40 and try to run that for each 800. My 3 hour and 40 minute marathon time converts to a 3 minute and 40 second 800. Here's a little article from Runner's World about this magical 800s. Enjoy!