Why do i only get adrenaline rush sometimes?
Like when i sparred with this huge amateur boxer i had no adrenaline rush. he whooped my @ss and i was even scared to take punches but other people were in the ring training too. But, when it's only me and another guy in one ring, then i get the adrenaline rush regardless of size. I'm not afraid to get hit and can take hits too. Why does this happen?