Might try 3 sets of 20 reps of the clean or jerk. Or just the clean part. DL's and full squats apply here also. Do not even need a lot of weight.
Can also use the Tabata protocol with any of these compound exercise. You just might be praying for death after going through a few sessions of these. Brutal at first, so break in slowly.
There is the old PHA system , which was outstanding for stamina (endurance and strength). Coach offered something like it, but there was no/zero rest between exercises. When the last exercise was done in the extended set you would go back to the first exercise again...without any rest time at all. Usually 4 to 8 cycles per workout. That's about 20 to 40 minutes of non stop enjoyment. This is not a regular training method, but used from time to time, for special needs of some of the football players. Lighter weight was used at first. After a time somewhat respectable weight can be used.
Not critical but: Wonder why the coaches program does not have more direct lower body or ab work for the players? Good Luck.