If you look closely for only 4 top rows,
at a given time,
1st row - 2 people in each of 8 = 16
2nd row - 1 people in each of 8 = 8
3rd row - 1 in each of 4 = 4
4th row - 3 in each of 4 = 12
vertical roll: 3 people in each of 4 = 12
Air: 1 people in air at 4 = 4

Total of 52 people
3 sets of 4 rows = 52*3 = 156