Run - Treadmill (hill intervals) 23:03 [3] 4.82 km (4:47 / km)
ahr:150 max:160
Series of 8 rolling hills - a minute uphill at 3-5%, followed by a minute downhill at 3-5%. Some level before and after interval period.
Heart Rate holds at peak for about 30 seconds after 'cresting' hill, then heads down. Increase in heartrate on uphill usually kicks in within 10 seconds.