Christian Bale gained 90 pounds (ish) of muscle between 1 and 2 years - the machinist 2004 to Batman begins 2005 (I couldn't find filming dates). If it was one year, is
![Eight times Christian Bale's jaw-dropping transformations left us stunned | Entertainment Gallery News - The Indian Express Eight times Christian Bale's jaw-dropping transformations left us stunned | Entertainment Gallery News - The Indian Express](https://images.indianexpress.com/2017/10/the-machinist.jpg)
Eight times Christian Bale's jaw-dropping transformations left us stunned | Entertainment Gallery News - The Indian Express
![10 of the biggest on-screen transformations, from Christian Bale in Vice to Tilda Swinton in Suspiria | The Independent | The Independent 10 of the biggest on-screen transformations, from Christian Bale in Vice to Tilda Swinton in Suspiria | The Independent | The Independent](https://static.independent.co.uk/s3fs-public/thumbnails/image/2019/01/24/12/vice.jpg?width=1200&height=1200&fit=crop)
10 of the biggest on-screen transformations, from Christian Bale in Vice to Tilda Swinton in Suspiria | The Independent | The Independent
![Christian Bale looks trim and fit on the set of Ford v. Ferrari following weight gain for Backseat | Daily Mail Online Christian Bale looks trim and fit on the set of Ford v. Ferrari following weight gain for Backseat | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2018/09/28/15/50C6631200000578-0-image-a-23_1538143847765.jpg)
Christian Bale looks trim and fit on the set of Ford v. Ferrari following weight gain for Backseat | Daily Mail Online
![From 'Vice' to 'The Machinist': Here are Five Stunning Christian Bale Body Transformations | Decider From 'Vice' to 'The Machinist': Here are Five Stunning Christian Bale Body Transformations | Decider](https://decider.com/wp-content/uploads/2018/10/many-bodies-of-christian-bale.jpg?quality=80&strip=all)
From 'Vice' to 'The Machinist': Here are Five Stunning Christian Bale Body Transformations | Decider
![Eight times Christian Bale's jaw-dropping transformations left us stunned | Entertainment Gallery News - The Indian Express Eight times Christian Bale's jaw-dropping transformations left us stunned | Entertainment Gallery News - The Indian Express](https://images.indianexpress.com/2017/10/batman-begins.jpg?w=350)