Gibraltar Gardens Route
Alternate 1 min walking with 1 min jogging for 20 mins. I can’t imagine heart rates going too much over 160ish subject to pace you jog at of course and they should ideally fall to a minimum of 130 during recovery.
I lost count and ended up running 13 reps rather than 10. Heart rate within ranges specified. I did pick up the pace to keep rate nr 160. Uphill towards the end. Quite an easy session which is I guess reflected in number of calories burned (256cal).