Nearing the end of December before my big goal is in place.  I have spent my exercise time with kettlebells.  2 - 3 times a week.  Plenty hard enough....not enough cardio.  Not because kettlebells isnt cardio, but more because I am just now learning the moves.  I have discovered that I need to work more on upper body.  Quads are not a problem.  I am sure that my butt will be sore enough once I am back on my bicycles.