Per the MHSAA
This is failure to be properly equiped. The shorts worn over the tights, even though pads are in place, does not meet the specifications for legal pants.
I have been searching the web for some good training films that I think you might enjoy studying. I will continue to search and put up more videos in the future.
Line of scrimmage(link below)
Down, fumble, progress and goal line(link below)
Line to gain/holding/Scrimmage kicks
Blocking below the waist/Free blocking Zone
Click the link below
Play clock management
Illegal hits..Blocks in the back
Please note that in some games the MTFOA puts their UMPIRE on the same side as the Referee. We do not do that in Michigan
Dead ball personal fouls/Illegal Participation
Passing plays/Catch-no catch
Scrimmage kicks and kick offs
Please note that the narrator uses the term OFF SIDE instead of ENCROACHMENT. There is NO off side in high school football. Also, you will see some poor mechanics as well as good mechanics. See if you can identify some of them.