They totally had a training montage. The good part was, being myths and/or super-people, all of them had crazy good endurance. They had to fake that they were winded at things like running, and were able to keep ahead of the pack on anything that had to do with physical conditioning.

The downside was that wasn't all there was.

Kon knew how to fire a gun and he knew how to do it well, but it was very clear during practice at the firing range that he hated having to do it.

At least it wasn't sniping. He...he had done sniping more than anything. He didn't want to do sniping. No more sniping.

"Hate guns, hate 'em, hate 'em, hate 'em..." was his mantra all throughout target practice. The fact he was such a crack shot was why.