You can’t train slow. Your “foundation” work needs to be fast. It’s simple. This is statistically proven this year in the nfl.
It will take until after week 4 for the high percentage of injuries to slow down. This isn’t an indictment on the work ethic of any player injured. It takes time to adapt to max velocity comp. They were robbed of that in spring/camp/preseason.
Speed prepares for speed.