10. Terminator 2: Judgement Day (1991)

The Movie: Ground-breaking sequel in which future saviour of mankind John Connor is targeted by a deadly new Terminator (Robert Patrick).

The Extreme Performance: Linda Hamilton went from poofy-haired wallflower in The Terminator to ball-busting warrior in T2. She trained for 13 weeks, three hours a day with former Israeli commando Uzi Gal. Her training included lifting weights, Judo and learning to pick locks. It was so extreme that she refused to do it all again for T3.