Once the season is going along, coaches don't practice with full pads all the time. They may go two days a week. This saves on the physical condition of the players. There is usually a spring game against each other at the end of spring practice. The game that colleges play against each other or intrasquad at the end of spring drills.
Coaches play first team against second team.
They can check on the progress of young players and work on all aspects to the game. The process college coaches use to enroll new players to their school and team. Coaches evaluate high school players on their talent and try to get them to play for their school.