I did some crazy things just to change the mood and take away from the monotony.

1)We did silent drill on the field. No playing AND no counting out loud. It would help everyone see where/when to move and who wasn't getting it.

2)We did "mini" show in the band hall. No chairs and everyone off to the sides. Then one section or group at a time would marching and play the show or parts or whatever. Yes, the step size was 1,500 to 5 but once again it should moves and playing levels. Also worked on toes up since every foot was tiny.

I just tried things. Some worked and some failed miserably but at least we were still getting some sort of reps.

Best of luck.