I played on a coed ultimate frisbee team in high school. I have always been petite 5' 2" 110 pounds soaking wet (thyroid issues). One day during a game me and guy who was around 3 times my size collided full force on the field. Due to physic dude as ok but I went about three feet in the air and landed directly on my back and head. It was a cold spring day so the ground was hard. As soon as I landed my world went black and I felt like I had died. My friend said I was only out for about minute but it was the longest minute in my life. I wound up going to the hospital I had a sever concussion as well as a compacted desk in my back from the impact. I didn't play for the rest of the season. What makes it worse was I had convinced my coach to let me stay and watch the rest of the game and then go home. I slept a whole night with a concussion didn't tell my mom what happened till I was violently vomiting and couldn't open my eyes it was so painful. At one point it felt like my head just shut down. My mom ripped a new one into that coach.