5.9m Airport hill

Backing searing heat.  Like running through a soup of heavy air. Each patch of shade I sought out brought some relief as did the occasional breath of wind that blew.

I felt like perceived effort was very high, but with the heat I just managed the 8 min miles I did at the marathon. But the perceived effort matched the hrt. Garmin rated that as 4.8 out of 5.0, so did I. Thanks Garmin!