This challenge is good for all comers. Whether skipping is your nemesis or you're already very proficient there's still a challenge here for you.
Directions (if you can't yet double-under)
Your goal for the month will be to develop your skill at performing double-unders. Your coach will be able to offer tips on adding this to your programming so that you can work on this skill.
By the end of the month, post whether you've achieved the skill, and if so how many can you do?
Directions (if you can already do them)
If this is you, then your focus should be on stringing reps together. Your goal will be to complete the most unbroken double-unders you can by the end of the month.
This challenge can be attempted multipletimes. Just erase your old score when you improve upon it.