Tried to use my Yoga Cards, but found they as well as most any other attempts did not work well on a bumpy, shimming train.  My sleep didn't fair well either.  But once visiting friends, one who had recently had a heart attack, I found the deck's purpose.  My friend had started a slow cardio routine, but this was a perfect supplement.  He was so grateful when I left this parting gift.  I told him that he had the Yang down....now it's time for the fun part.