This morning I ran yassos on the track with a partner down in Fulton. Yassos, named for Bart Yasso, are just repeats of 800 meters, or two laps around the track. The idea of yassos is that they can be a predictor for marathon times, if used in training. If one's goal marathon time, for example, is 3:25, then one should work her way up to 10 repeats of 800 meters each, at 3m25s. Supposedly if someone can do that, then she will be able to meet her marathon goal time.
More information can be found in this Runner's World article.
This morning, I ran 8 yassos in 3:25. Two more to go.