1The fast stretch
From 13.5 km to 16.1 km
2.6 km · -2.8% average · 38.5 km/h · 144 bpm, peaking at 153
That quick section near Swinbrook sat right in the middle of the ride, and your heart rate climbed noticeably even though the ground was helping you along—worth noticing whether you were pushing harder than the shallow descent really called for.