The problem with your previous post and why that can't work is the weather in Illinois.
The states that don't do football activities in the summer are in the south and have spring football practices. You can't do that in Illinois.
People act like players and coaches don't like practicing together in the summer - getting ready for the season. If you love football - you love spending two hours together practicing your craft. If you don't, either the program culture needs work or you don't love football.
I really like the way Batavia does it. June and the first week of July is weights or off. and then Football camp for 4 weeks in July. They use 19 out of the 25 contact dates.
Batavia Football Calendar