If you haven't already, check out Narcos including the Mexico seasons. I'm also just starting third season of Babylon Berlin, set after WW1 and providing a fictional account of the road that led to WW2.
Here ara few series I've watched on the treadmill:
Netflix: Rectify, Formula 1: Drive to Survive, Criminal Minds, Schitts Creek, The Ranch, Magic for Humans, Ozark, Shooter, Hinterland, Broadchurch, Lillyhammer, Hell on Wheels, Blacklist, Peaky Blinders, Longmire, Breaking Bad
I've been logging in a lot of miles on the treadmill