Here is a compilation of tips and links I have come across or been offered. Someday I will post that I have them. Someday SOON I hope.
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- "Stop doing single unders, you have to just tell yourself that you will do double unders and get out there and do them" --LG
- Rope as long as ground to nipples. Slower, higher jumps. (Few other people mention the speed as slower than SU) --Mike McGoldrick, http://fitr.tv/blogs/fitr-tv/6332336-how-to-do-picture-perfect-easy-double-unders
- "Make sure the hands stay to your side, so that if you drew a line from hand to hand it would go through your body" http://fireofthegodsfitness.blogspot.com/2012/07/double-under-demo-intro.html