Yesterday, I went to the track and did 8 x 800 meters from 3:40 to 3:30. I probably should have run even easier. I felt tired and heavy from my hard day Tuesday. This is how it goes, one day you feel great and run faster than you expect and maybe faster than you should, and then you have to recover. I plan to go pretty easy today, not much faster than 7 minute mile pace. I have to be very careful not to over stride - I think over striding is how I strained my left foot again and my left hip. Also I am going to use my inserts that have a little more arch support and are more rigid. I have had to deal with plantar fasciitis in my left foot on and off for years. The best treatment I have found is soaking my foot in ice water after I run.