>> sprint car racing is a sport that's all about taking risks. >> i think the reason that kevin ended up flipping his race car as violently as he did is kevin and his crew made a guess about setup on the car. they made a guess on how fast that car could get through the corner and how they could adjust the race car in order to get him through that corner, and i think they guessed wrong. >> but experienced drivers like tony know, you've got to take the spills with the thrills. >> that's part of racing. ask anybody in this pit. that's part of this deal. if you go fast, that's going to happen. some guys are fortunate and some guys get themselves in bad positions. coming up -- two gymnasts learn the laws of physics the hard way. >> we knew it was going to be dangerous. >> i just remember hitting the horse, being in a huge amount of pain. ♪