I Live in Another World by Lifting Iron.

Chen Pingan fell on the rails and did not die. Good news: I traveled through time and turned out to be an aristocratic gentleman. Bad news: The territory is about to go bankrupt, and he is known throughout the principality as the "cultivation shame." Worse news: If you want to survive, you can only rely on... Exercise? ! While the strong men from other worlds were meditating, chanting incantations, and cultivating their fighting spirit, this down-and-out baron was competing with his homemade stone locks: "One set of squats, lifespan +1; one set of bench presses, charm +1. Roll hard!" Until the demon army came to the city, the allies were desperate and the enemies were grinning. Chen Ping'an sighed and took off his heavy-bearing clothes: "I originally wanted to get along with you as an ordinary noble, but what I got in exchange was alienation. No more pretending, I'm showing my cards." "I just want to ask -" "Have you ever heard of the 'Seventh National Radio Gymnastics and Magic Improved Edition for Primary School Students'?"