The Daily Mail in the UK seems to think that he is. I’m sure this is probably the best shape he’s been in, but I would not call this “Superhero Strong”.

The buff reveal! Paul showed off his new fit frame as he played baseball in Mexico

Yes, I feel slightly pervy, but I’m working to keep you informed!! Also note the color of his shorts: Ant-Man colors….am I reading too much into this photo? Probably…

Paul Rudd reveals his buff physique as he enjoys a holiday in Mexico | Mail Online.