Double-under technique work
10-20-30-40-50-40-30-20-10 reps for time of:
Unbroken double-unders or unbroken Singles*
*If you break/miss on that set, you reset on that number (i.e., if you miss on double-under 47 of 50, you have to restart your 50, not the entire workout. Also, you must stop after each set it complete).