Group Run 030818
Warm up on west side from Columbus Circle to Marionette Theater.
Continue up west side, around top of park and down to E102 at MGP
Surge for clockwise Harlem Hills loop from E102 to E102
When back at E102, revert to MGP
Continue down east side to E72.
Cool down south on east side and around to Columbus circle
Surge as aggressively as your little heart desires, but make sure you're able to immediately revert to MGP, and hold it the whole way back until the cooldown.