Blake Lively worked out for 13 hours a day in ‘The Shallows’.
The ‘Gossip Girl’ star says the movie’s action scenes were so intense that she felt she was working out for the entire shoot.
She said: "Well, you know, I had an amazing trainer. I was fortunate to have Don Saladino help me out and he just kicked my butt in the best way, in the most healthy way …
"Being in waves like that, swimming like that, doing such long takes like that all the time – I became so much stronger and more fit by the end of production. I was working out 13 hours a day because shooting was working out. It was neat to be able to do that, and it was neat to have that challenge after having a baby, because you think your body is so different – you think no matter what, it’s never [going to be] totally be the same."
And the 28-year-old actress – who has 17-month-old daughter James with Ryan Reynolds – also revealed she took advice from her husband before accepting the role.
She added to Entertainment Tonight: "He was very kind and generous to read the script. I was really sick [at the time] and I was working, and so he read it and he was like, ‘Aww the action is amazing.’
"[For this film] he said, ‘Be prepared, this movie is a physical challenge, it is an athletic event. It was like training for a marathon."
Meanwhile, Blake previously revealed it was like a "marathon" training for the drama movie.
She said: "It was really crazy. But it was also nice to have that motivation because I wouldn’t have done that. I wouldn’t have gotten in that kind of shape.
"It was like training for a marathon, but a marathon is one day. This was six weeks straight, six-day weeks, no lunch breaks, thirteen-hour days, four-foot waves at all times. By the time I was done with the movie … I had muscles that I had never had before."