mile repeats

One of my favorite workouts yesterday, but sooo hard. I couldn't have run any faster afterwards.

4xmile (6:38-6:44) with 200 jog in between. After the first two miles, I had to do a 200 walk and then 200 jog in between splits. :(

6:42, 6:36, 6:48, 6:39 - Have been feeling really sluggish lately.