Many Olympians rely on other athletes for their success. In basketball, soccer, volleyball, water polo, crew and relays, you need teammates or partners competing at their mental and physical peak for any hope of winning a medal.

    But at least those teammates are human. Having a horse for an Olympic partner is somewhat more involved. Since equestrian requires experience on so many different levels, riders reach (and remain at) the elite level far later.

    So, at age 48, Beezie Madden is vying to return to the Olympics, with a new horse but the same goal: gold. Jim Caple » Madden's path Video