1 set:
:40 single-unders
:20 hollow rocks
:10 rest

1 set:
:20 single leg single-unders (right leg)
:20 single leg single-unders (left leg)
:20 hollow rocks
:10 rest

1 set:
:40 jumping jack single-unders
:20 hollow rocks
:10 rest

1 set:
:40 split jack single-unders
:20 hollow rocks
:10 rest

10min Double under practice and progressions

6 rounds for time:
50 double-unders
25 weighted sit-ups (14/20 lb)

Intermediate:
25 double-unders
25 weighted sit-ups (10/14 lb)

Beginner:
50 single-unders
25 sit-ups

3 sets:
1:00 plank hold
20 GHD hip extensions