trail run 1:20:00 
The first 20 minutes was warm up and then we did 12x3 minute intervals with 1 minute rest. The intervals were done basically as hard as I could go, which meant the HR was between 175 and 192 depending on the ups and downs and which interval it was. The first couple my HR was fairly low and then dad said he was catching me on the hills. From then on I pushed really hard, and my HR doesn't read right when I'm running on neven ground. Then my legs were getting really tired and it was difficult to get the HR above 188.