From the article: "Anderson said deaths happen during practice rather than competition and recommended that linemen should be trained based on what is demanded of them during a game."
This statement just seems odd to me because that is what coaches do, train based on what is demanded of them during a game. They also have to be conditioned for the amount of physical exertion that happens on every play. Maybe I am interpreting it wrong. That being said. I played in the 80s, coached in the 90s early 2000s. Kids have gotten much bigger since then. Is it hotter now then in the 80s? Not sure without looking at the data. I remember it always being hot and humid when summer camp opened in August. However, that being said, we were always outside in the summers(I wo and did not have air conditioning(we slept in the basement where it was cooler). Practice was structured as 3 a days, sessions with water breaks because we always had to bring a thermos full of water(Like a gallon jug), 8-11, 12:30 - 2:00(skill players no pads outside, Big Uglies doing some conditioning, agilities, lifting weights, going over plays inside), 3:00 - 5:00 all team back in full pads, with water breaks. Most of the heavy physical stuff was always in the morning session when it was cooler. I do remember some players hurling during sled drills in the morning because they came to camp out of shape or guzzled some shake right before practice. The expectation was to be conditioning all summer before you showed up to camp. You couldn't get in football shape in the 2 weeks of summer camp leading up to the season. I know many teams have heat conditioning practices leading up to summer camp.
I think other issue is that coaches need to be trained to identify heat related issues and not be Neanderthals' stuck in the 70s/80s seeing needing water as a weakness. Times have changed.
Also, some teams play games at 12:00 and 1:00 on Saturdays so your players need to be conditioned to play in hot weather as well. It is fine line to balance. Early games at night can be super hot as well.