Students enter the gym and go directly to the bulletin board or whatever space you choose to use to display the activities. You have a different set of activities for everyday of school till students leave for Christmas break. On each paper the number is listed (which represents the number of days till break) and 3 exercises. The 3 exercises represent cardio respiratory endurance, flexibility, and muscular strength/endurance. The student completes each activity the number of times that represents how many days of school are left till break. After all exercises have been completed individually or with a partner, the students walk around the perimeter of the gym till the next activity begins.

Example: (we had 18 days till break when I began the activity)
18
Tuck jumps
Curls ups
Seconds of stretching

17
Line jumps
Wall Push ups
Seconds of stretching

16
Star Jumps
Frog Jumps
Seconds of stretching

Bulletin Board Used

Consider using and adapting for other breaks - fall, spring, summer. Adjust activities to meet the break.

You could add an explosive category using tuck jumps, frog jumps, rabbit hops, etc. And mix in upper body and lower body strength work as well as using a core category that addresses both front side and back side (sky divers, supermans).