understander
n.— «With his great physical strength and unerring sense of balance, Most developed a reputation as a champion “understander”—the term for the bottom man of the human pyramids for which Muscle Beach was famous.» —“Deforrest ‘Moe’ Most, 89; Gymnast Was Unofficial Ringmaster at Santa Monica’s Muscle Beach” by Valerie J. Nelson Los Angeles Times Sept. 8, 2006. (source: Double-Tongued Dictionary)