10 kb box step-ups (5r/5l)
10 kb Russian twists (total)
20 double unders
AMRAP in 20 minutes
Option 1: unbroken double unders
Option 2: 50 unbroken single unders
Unbroken means the full set is completed without tripping up or intentionally stopping. If you stop or trip up before 20 or 50, you go back to zero.