A lump in your throat. Goosebumps. Elation. Shock.
Track and field is a sport that is made for such feelings, and after a thrilling Olympic Trials, it looks like American athletes will be giving us plenty of exciting moments in London.
Looking back on past Olympic thrills and chills (with a little help from YouTube) can get your heart rate up, just like it did the first time. Here are the top 15 heart-pumping moments, both good and bad, in American Olympic track and field history.