LONDON — Misty May-Treanor danced on the sand and then off it, taking a victory lap around the court before leaving Horse Guards Parade with Kerri Walsh Jennings as three-time Olympic beach volleyball gold medalists. Walsh Jennings and May-Treanor extended their Olympic winning streak to 21 in a row — unbeaten in Athens, Beijing and now...

Misty May-Treanor and Kerri Walsh Jennings have been partners on the sand for more than a decade, long before they each aquired a third name. To that end, they know each other really well. The two-time reigning Olympic champions spoke with us about guilty pleasures, hidden talents, and how they would make the royal guards in London laugh. What...