Lynda Wallace of Bowie, Md., right, dances at a soul line dancing night in Jessup, Md., on Feb. 26. (Photo by J. Lawler Duggan for The Washington Post) The beat speaks through his feet. Nelson Spires ...

Gloria Kingcade calls this her ministry. Every Wednesday, she's at the Sheller Center in North Philadelphia, leading a room full of dancers through the steps of soul line dancing. "I've been teaching ...