There always seems to be one show my wife and I run across during the summer-- when most of the shows we usually watch are in reruns. Last year, we started watching American Ninja Warrior on NBC, mainly because there wasn't much else new on one night. Turns out, we kind of liked it. A few years before that, I started watching Alaska State Troopers on National Graphic. Well, this year, there's another show of which I've become a fan: American Muscle, on Discovery.