"Is this per side or total?" Workout

2 people start, next 2 go once ski erg is free

Ski Erg Lunge x4 (total)
Battle Rope Alternating waves x10 (total)
Glute Bridge March x10 (total)
Superman x10

8/20/20/20
12/30/30/30
12/30/30/30... continue with 12/30/30/30

15min AMRAP
*passing allowed

20min