Track practice inside at Schroeder. Did a 10 min w/up, then started the Rep workout with the kids. I did the first 600 in 2:17, but it felt a lot harder than that. I had to call it quits after 450m on the 2nd one (the kids did 4x600, 3x300) - it was clear that there was something wrong, involving some muscle aches, so I figured I was a bit sick. The diagnosis was confirmed when I tossed the proverbial cookies when I got home to take Z to soccer.