AM Clubhouse [PE] / Tardies

I am noticing that lately more and more students are arriving after the 8:15 bell.   

When it is not raining, "AM Clubhouse" [school-wide PE] starts promptly at 8:15 with The Pledge of Allegiance.  After the Pledge we do about 4 minutes of movement/stretching until 8:20.  This 5 minutes is not "wriggle room" to arrive by 8:20.  Students are expected to be on the blacktop--ready to go--by the 8:15 bell.   When it is raining, we will have AM Clubhouse inside the classroom.  This will start promptly at 8:15.    

Students are considered TARDY when they are not in line on the blacktop at the 8:15 bell, or in the classroom by the 8:15 bell.