Inexplicable

Runners know well how it is. Struggling with an easy run one day, and cruising through a fartlek workout the next.

That was how I felt. Struggled with yesterday's easy 10km run, found the heat and humidity hard work. Then this evening, with a cool breeze and lower temperatures, I was surprised at how relatively enjoyable the 4x1 km fartlek (target 6:40 pace) workout went.

Pace and HR
6:38@148
6:35@149 6:23@156 6:26@150

1km recovery jog in between.