So why do double unders? If I can spin the rope twice under my feet, how does this make me fitter? If you remember the 10 physical skills which CrossFit develops, they include accuracy, coordination, and balance — double unders develop all three of these essential skills.
As any CrossFitter knows, midline stability is central to nearly every single movement performed in a WOD. In other words, developing a strong midline leads to better overall fitness. Double-unders are also practice in opening up the hips explosively, needed for cleans, push press, and Olympic lifting in general.
One thing is certain: not practicing double unders will not lead to improvement — so face your goat head-on and become a better athlete in the process!