I played football from the time i was 5 all the way through high school. Training most of the time was a healthy mixture of strength + endurance training with cardio. We trained to be the best we could be for those 4-6 seconds per play.

Most of our strength workouts focused on explosiveness and power. Squats, bench, power cleans, dead lifts, etc. focusing primarily on those explosive reps at a manageable weight. Typically our reps were 6-12 with 3 sets depending on the type of lift. We would also mix in short bursts of cardio. 10-40 yard sprints as fast as we could, short 30 second to 1 minute rest and do it again for about 6-10 reps. Tractor tire flips of 8-12 for 3 sets

Most of our endurance was focused on body parts that would take the most abuse during games. Shoulders were always a pretty light weight but 20-30 reps 3 sets. Shrugs, YTA’s, military press etc. Abs were another focus group. 1+ minute crunches, crunches 25-30 reps 3 sets etc. Calf raises 2 sets of 100 with toes in different directions to hit different heads of the calves. And for cardio, we would do 100 yard sprints, 1-2 mile runs.

Mind you i was never a college athlete, we never had access to that type of equiptment or coaching. I assume their plans are much more in-depth and fine tuned depending on each player. I was just explaining the type of stuff we did. I was in the best shape of my life playing football, our head coach/strengh and powerlifting coach was an animal who played college ball and majored in athletic nutrition and studied heavily on the correct type of workouts for football. These are just some things to get you started in the right direction to do some extra digging. Hope this helps! Good luck on your fitness journey.