Big meaty Proletariat Batman
In this issue he beats off a bunch of white supremacists
Here is the link to the annual issue, its a standalone story so if you want you can start with it
The first story is written and drawn by Daniel Warren Johnson, he made a really good transformers comic here is a link to issue 1
The time that the old Batman spent learning every martial art known to man, new Batman has spent bulking.
This is actually a great explanation. No less dedication, but far fewer resources.