5 x 600M running intervals

Went to the track for 600M running intervals. Man these are hard!! (as is all speedwork). It was a nice day though, 60 degrees, which allowed for a long sleeve and shorts. At least on the track you don't have to worry about people who got their drivers license out of gumball machines. I'm feeling better coming off of this cold, but am not at 100% for higher intensity work yet. On the 4th interval I almost packed it in it hurt so bad (breathing), I actually stopped @ 200M for a sec (there is a little little plateau in the HR) then remembered what real suffering is like (Cancun). Recommited and finished the interval, and the workout.

It's funny, the middle several intervals are always the ones that I want to bail on, but never let myself. The last is always no problem (because it's the last I think).