Those programs declined because they were preparing boys to go to war. I'm a bit amoral when it comes to this, I understand men will be needed to be ready when called into action, but at the same time I guess it infringes on personal liberty and freedom of choice with the draft. You can't have a country without also be willing to die for it.
Our school had a top of the line, brand new, fitness room with gym equipment, but none of the guys really used it to exercise. Other than myself, I can count maybe 2-3 guys in my class of 300 who took it semi-seriously. Our coaches would have us do maybe 3-4 stretches and some planks and then let us go about our business. More than half the class walked around the gym, and then there were a few dozen people in the center who played maybe badminton or soccer.
There was actually some stigma against working out among the student body. It was weird. When it came to the state exams, the instructors flubbed the numbers, hard. Girls couldn't do a single push up, guys could just get around 15-20 or so. To keep the class from failing they'd write it off. I can sort of sympathize with the instructors since it's hard to have actual discipline with students today, but at the same time I knew some of them were lazy f*cks who were in it for the paycheck.
I had a PE teacher who rolled her chair out into the center of the gym and sat her obese ass in it and told the students what to do. She couldn't do any of the movements herself, so when asked for instruction she'd have one of the students perform the motion.
Public high school btw. Private schools are definitely more invested, but not all.