The ultimate for me was the Japanese Gymnast who had a broken leg, who was in the Team Gymnastics competition who nailed his dismount from the rings, to allow the Japanese men gymnasts to win the Gold Medal.
I also liked Kerri Strug, who nailed her landing on a severly sprained ankle. She chose to do it, and she was 18 years old at the time, a young adult, for those who think Bela Karolyi made her do it.