What are Go 600's? I just found out today. You run 400 at your 5k goal pace and then GO for 200 to finish off your 600. We did 6 of these with a 2 minute rest recovery. I needed a water break after 4, so I took a 4 minute rest break and then ran number 5 with everyone as their last one. I ran my 6th one by myself.
My goal was to run the first 400 at 1:45, which is a goal 5k pace of 22 minutes flat. My actual times were between 1:28 and 1:34. My final 600 times were between 2:07 and 2:17.