12 hours = 5 Fartleks

Working 4am to 4pm today ,   12 hour shifts mean a loner lunch.   Logged a 10ker on my meal break with 5X200 meter fartleks thrown in.   I swear the treadmill is at least a half K faster then what it says.   I was soo hot when I was done and the HR was in the high 140s to low 150s.