The most eye-opening fact we learn from the Hercules trailer is that in ye olde Greek myth times, ladies wore G-strings. Mrs Hercules is seen wearing a thong, a come-hither smile and not much else besides when her demi-god husband, the son of Zeus, returns from completing those legendary 12 labours. Based on the graphic novel Hercules: The Thracian Wars, the film has Hercules (Dwayne ‘the Rock’ Johnson) planning to retire when the king of Thrace comes knocking for a bit of muscle to help in a fight against a tribe of tattooed green men sent to earth by Hades. Johnson took on a hardcore training routine to get in shape for the part, he recently told a fitness magazine: "I trained and worked harder than ever for eight months for this role. Lived alone and locked myself away like a moody 260-pound monk." So there.