Life swings between triumph and failure in the enthralling “El Gran Salto” produced by Atresmedia TV in collaboration with Banijay’s Diagonal TV, the force behind shows such as “Isabel” and “La Catedral del Mar.”  Spanish star Óscar Casas (“Instinto,” “Xtremo”) stars as Olympic Gold Medalist gymnast Gervasio Deferr. The series is written by “Bye” scribe […]