CREATE TABLE table_76701 ("Club" TEXT, "City" TEXT, "Sport" TEXT, "League" TEXT, "Venue" TEXT)

Which sport was held in Huntsville at the Von Braun Center as part of the Southern Indoor Football League?
SELECT "Sport" FROM table_76701 WHERE "City" = 'huntsville' AND "Venue" = 'von braun center' AND "League" = 'southern indoor football league'
SELECT "Sport" FROM "table_76701" WHERE "City" = 'huntsville' AND "League" = 'southern indoor football league' AND "Venue" = 'von braun center'