4 x Tabata (8 rds 20 seconds ON/10 seconds OFF) with one minute rest between Tabata sets

Swap Cardio machine after 4 rds

1. RowErg
2. BikeErg
3. SkiErg
4. RowErg
5. Echo bike
6. SkiErg
7. RowErg
8. BikeErg
9. SkiErg
10. RowErg
11. Echo bike
12. RowErg
13. Assault Airbike

Bonus

1 x 8 rds of 10 seconds ON/20 seconds OFF) of max effort
Swap Cardio machine after 4 rds