In preparation for his return as Matt Murdock in Daredevil: Born Again, British actor Charlie Cox took his fight game ... taking deep dives into the science behind muscle building and fat loss ...

I tend to do five days," Cox said. "Before the show ... "We'll do some primary muscle, but in a sport-specific, functional way, not the heavy three sets of 12, then you rest ...

Charlie Cox is probably not the first Marvel actor to complain about sore muscles. But after10 years of playing the Man Without Fear, things tend to get a little difficult.