This morning I went back to the track. It was humid and my left foot is still a little sore. I did my usual 8 x 800 meters from 3:32 to 3:10. My heart rate was near 160 bpm by the end. I need to make sure I ice my foot when I finish running. Tomorrow, if my legs still feel tired or heavy, I may do all 8 800s at 7 minute mile pace or slower (no faster than 3:30).