Actress Shailene Woodley has revealed that she quit caffeine just before filming began on 'Insurgent' and confessed that she found an alternative energy-booster to take its place. 

During an interview with MTV News, the beauty explained that she stopped drinking coffee but found that she still needed a pick-me-up: "I stopped drinking coffee right before we started filming. So hour eight would roll over into hour nine and I was like, ‘S**t man. I need some caffeine.’ But caffeine was just making me tired. So I was like, ‘What wakes you up quickly?’"

Woodley went onto add that she discovered exercise had the same energising effects so she and the cast ended up doing "200 to 250 push-ups a day — every day.” She then joked that this switch-up was just for the filming period: "I haven’t done them since we wrapped!"

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Watch Woodley talking about the on set push-ups here: