Grouse Grind Post

During the Grouse Grind i believe i reached zone 4. My heart was beating a lot faster than usual and my body temperature increased dramatically causing me to sweat and get dehydrated. The higher i went up the mountain the more steep it got. It became very hard to climb the mountain once i hit the half mark. My muscles were tired and i wanted to give up and just go back. I had no energy left and my pace slowed down a lot.I believe my aerobic system was used during the grouse grind because it was high indurance and my heart rate increased. During the Grouse my fat was used to fuel my body and give me more energy and then burned off as sweat and cellular respiration.